**Subject**:**Volume 3, Number 4****From**:**"Ken Tice" <kst@ebrock.cam.nist.gov>**- Date: Thu, 25 Mar 1999 15:03:59 -0500
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o - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - o - - - JULY 15, 1996 - - O P - S F N E T Volume 3, Number 4 - - ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ - - Editors: - - Tom H. Koornwinder thk@fwi.uva.nl - - Martin Muldoon muldoon@yorku.ca - - - - The Electronic News Net of the SIAM Activity Group - - on Orthogonal Polynomials and Special Functions - - - - Please send contributions to: poly@siam.org - - & address changes to: poly-request@siam.org - - - o - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - o Today's Topics: 1. Minisymposium on Modern Topics in Orthogonal Systems 2. Business Meeting in Kansas City 3. Askey and Rota Lectures during Seattle Mathfest 4. Chokika (Hypergeometry) Festival in Kyushu 5. Centenary conference at University of Wisconsin - Madison 6. ISAAC Congress 1997 7. 9th International Conference on Formal Power Series and Algebraic Combinatorics, Vienna, 1997. 8. Report on Umbral Calculus Workshop, MIT, April 1996 9. Report on Chebyshev Memorial Conference, Moscow, May 1996 10. Report on Workshop on Special Functions, Montreal, May 1996 11. Report on Special Functions Session, Antwerp, May 1996 12. A computer implementation of the Askey-Wilson scheme 13. Obituary: Lawrence C. Biedenharn, Jr. 14. Richard Askey on Waleed Al-Salam 15. Book Report (Feinsilver and Schott) 16. Call for Questions (undergraduate research) 17. Problem (Kontorovich-Lebedev transform) 18. Changes of Address, WWW pages. etc. 19. ftp site for papers in Orthogonal Polynomials and Special Functions 20. Obtaining back issues of OP-SF Net and submitting contributions to OP-SF Net and Newsletter Calendar of events: see issue/topic: 1996 July 15-20: International Colloquium on Group Theoretical Methods in Physics, Goslar, Germany 3.1 #11 July 21-26: ICCAM 96, Leuven, Belgium 3.1 #12 July 22-26: SIAM Annual Meeting in Kansas City 3.2 #3 and 3.4 #2 July 23 and 26: Minisymposium on Modern Topics in Orthogonal Systems at SIAM Annual Meeting in Kansas City 3.3 #1 and 3.4 #1 August 10-12: Lectures by Askey and Rota during Seattle Mathfest 3.4 #3 August 23-30: Workshop Transform Methods & Special Functions 2.6 #10 (Varna, Bulgaria) September 1 - October 25: MSRI program on Enumeration and partially ordered sets 3.3 #5 September 9-12: Chokika (Hypergeometry) Festival in Kyushu 3.4 #4 September 23-28: III International Conference on Functional Analysis and Approximation Theory (Italy) 3.1 #13 1997 January 13-24: Workshop on Special Functions & Differential Equations, Madras 3.3 #6 March 17 - May 30: MSRI program on Symmetric functions and representation theory 3.3 #5 May 22-24: Centenary Conference, including minisymposium on special functions in Madison, Wisconsin 3.4 #5 June 2-6: First ISAAC Conference (International Society for Analysis, its Applications and Computation) in Newark, Delaware 3.4 #6 June 24-28: Continued Fractions and Geometric Function Theory 3.2 #8 (Trondheim, Norway) July 14-18: 9th International Conference on Formal Power Series and Algebraic Combinatorics, Vienna, Austria 3.4 #7 September 22-26: VIII Simposium sobre Polinomios Ortogonales y Aplicaciones, Seville, Spain (e-mail: 8spoa@obelix.cica.es) Topic #1 ----------------- OP-SF NET ------------------ July 15, 1996 From: Willard Miller, Jr. <miller@ima.umn.edu> Subject: Minisymposium on Modern Topics in Orthogonal Systems As announced in OP-SF NET 3.3, Topic #1, SIAG/OS is sponsoring this minisymposium at the 1996 SIAM Annual Meeting which will be held July 22-26, 1996 at the Hyatt Regency Crown Center, Kansas City, Missouri. We regret to announce that the July 26 talk by Robert Gustafson on "Multivariate symmetric orthogonal polynomials generalizing Jacobi polynomials and interpolation on symmetric lattices in $R^n$" has been cancelled. The remaining part of the program, including talks on "Wavelets" by Gilbert Walter, P. R. Massopust and T. Q. Nguyen on Tuesday, July 23, 8:30 to 10:30 a.m. and the talk by Amos Ron on Friday at 8:30 a.m. will go ahead as scheduled. Topic #2 ----------------- OP-SF NET ------------------ July 15, 1996 From: Charles Dunkl <cfd5z@Virginia.EDU> Subject: Business Meeting in Kansas City Members of the Activity Group and other interested participants at the SIAM Annual Meeting are invited to attend a short business meeting at 9:30 a.m. on Friday, July 26. This will follow (and will be held in the same room as) the talk by Amos Ron, identified as MS57 in the Conference Program. We hope that it will provide an opportunity for discussion of future Group activities, especially future minisymposia. Bill Miller, our Program Director will preside at this meeting. For those who cannot attend the business meeting, it should be mentioned that Bill (miller@ima.umn.edu) and Martin Muldoon (muldoon@yorku.ca), OP-SF NET co-editor, will be attending the whole SIAM meeting and will be glad to meet with members to discuss the Group's activities and programs. Topic #3 ----------------- OP-SF NET ------------------ July 15, 1996 From: The Editors <tkk@uva.fwi.nl>, <muldoon@yorku.ca> Subject: Askey and Rota Lectures during Seattle Mathfest At the AMS-MAA Mathfest (Summer meeting) in Seattle, Washington, USA, August 10-12, 1996, there will be four lectures dealing with binomial coefficients and theorems: - Gian-Carlo Rota, The many lives of binomial coefficients, August 12, 10:40 (AMS-MAA invited address) - Richard A. Askey, The binomial theorem and some extensions Lecture 1: Some of the history of the binomial theorem and its extensions Lecture 2: Refined counting and a noncommutative version of the binomial theorem Lecture 3: Integral analogues of the binomial theorem, orthogonal polynomials and education 10, 11 and 12 August, 9:35. (MAA Earle Raymond Hedrick Lectures) See "http://www.ams.org/amsmtgs/2017_other.html" for more information on the Seattle Mathfest. Topic #4 ----------------- OP-SF NET ------------------ July 15, 1996 From: The Editors <thk@fwi.uva.nl>, <muldoon@yorku.ca> Subject: Chokika (Hypergeometry) Festival in Kyushu The following announcement appeaers on the WWW site http://www.math.s.kobe-u.ac.jp/rchs/ September 9 (Mon) --12 (Sat), 1996 Chokika Festival in Kyushu Department of Mathematics, Kyushu University and its neighborhood The main purpose of this festival is to drink, eat and discuss various subjects for our mutual understanding. Hypergeometric functions will be served as main appetizers. For further information, please contact: Masaaki YOSHIDA (myoshida@math.kyushu-u.ac.jp) Note by M.N.: Chokika is the Japanese noun which literally means "hypergeometry". It can be used to refer to anything hypergeometric (not only hypergeometric functions or hypergeometric equations). Topic #5 ----------------- OP-SF NET ------------------ July 15, 1996 From: Walter Van Assche Subject: One-day meeting in Leuven on Constructive Complex Analysis On Thursday November 28 a one day meeting will be organized at the Katholieke Universiteit Leuven. The topic is Constructive Complex Analysis Speakers are * Arno Kuijlaars: "A survey of approximation, potential theory and Chebyshev quadrature" * Walter Van Assche: "An introduction to Hermite-Pade simultaneous rational approximation" * Jeffrey S. Geronimo: "Orthogonal polynomials on the unit circle with random recurrence coefficients" * Valeri Kaliaguine: "Spectral theory for non-symmetric operators associated with simultaneous rational approximation" * Guillermo Lopez Lagomasino: "Orthogonal polynomials with complex recurrence coefficients" More information can be found on http://www.wis.kuleuven.ac.be/wis/applied/cca.html Topic #5 ----------------- OP-SF NET ------------------ July 15, 1996 From: Charles F. Dunkl <cfd5z@Virginia.EDU> Subject: Centenary conference at Univ. of Wisconsin - Madison University of Wisconsin to Celebrate its Mathematics PhD Centennial On May 22-24, 1997 the Department of Mathematics of the University of Wisconsin - Madison will celebrate the 100th anniversary of the awarding of the first PhD in Mathematics by the University of Wisconsin in 1897. Invited speakers, who are being asked to discuss early work at Wisconsin and more recent work of former and current Wisconsin students and faculty, include: Richard Arratia, Richard Askey, Carl de Boor, Robert Brown, Joshua Chover, Michael Crandall, George Glauberman, William Jaco, Yiannis Moschavakis, John Nohel, Louis Solomon, and Walter Rudin. In addition, we are soliciting proposals for minisymposia organized by former students, usually in collaboration with a current Wisconsin faculty member. There will also be opportunities for contributed papers. Charles Dunkl will be organizing a minisymposium there on special functions. Mostly he will look for speakers with some important connection to Wisconsin. All current and former Wisconsin faculty, students, visitors, fellows, and other `Wisconsin friends' are cordially invited to participate in the conference. There is no registration fee. Rooms for the nights of May 21, 22, 23, and 24 (1997) have been reserved in the name of "UW-Math PhD Centennial Conference" at three nearby hotels and will be kept open until two weeks before the conference begins. A banquet/celebration evening is being planned for Friday, May 23, 1997 in Great Hall of the Memorial Union. Mary Ellen Rudin will be the banquet speaker. Other participants will offer reminiscences. A mailing concerning the conference to all people on the Mathematics Department's newsletter mailing list is planned for the early fall, and this will contain further information about registration and the banquet. Suggestions, proposals for minisymposia, queries can be sent by email to: phdcent@math.wisc.edu or by post to: Richard A. Brualdi Math Dept. 480 Lincoln Drive UW-Madison, Madison, WI 53706, USA These addresses can also be used to get on our mailing list. Further information on WWW: http://math.wisc.edu/events/cent.html Topic #6 ----------------- OP-SF NET ------------------ July 15, 1996 From: Wolfram Koepf <koepf@ZIB-Berlin.DE> Subject: ISAAC Congress 1997 In 1997, June 2-6, the International Society for Analysis, Applications and Computing (ISAAC) will hold its first Congress at the University of Delaware. Very broad area of analysis, applications and numerical analysis are covered by the program of this Congress. The work is organized within special sessions. One section of this conference will be devoted to "Orthogonal Polynomials" organized by Wolfram Keopf. The emphasis in this section will be on the use of symbolic computation in connection with orthogonal polynomials and special functions. Symbolic computation has the potential to change the daily work of everybody who uses orthogonal polynomials or special functions in research or applications. It is the purpose of the proposed section to bring together developers of symbolic algorithms and implementations which are connected with orthogonal polynomials and special functions with users of computer algebra systems who need this type of software. Further information about the conference and the special session will follow later. Topic #7 ----------------- OP-SF NET ------------------ July 15, 1996 From: Christian Krattenthaler <kratt@nelly.mat.univie.ac.at> Subject: 9th International Conference on Formal Power Series and Algebraic Combinatorics, Vienna, Austria, July 14-18, 1997. I have set up a WWW page for the conference: http://radon.mat.univie.ac.at/People/kratt/fpsac97.html Note from Editors: The following information was obtained from this page on July 6, 1996: 9-th International Conference on Formal Power Series and Algebraic Combinatorics (FPSAC'97), July 14 - 18, 1997, University of Vienna First announcement - Call for papers Topics: Algebraic and bijective combinatorics and their relations with other parts of mathematics, computer science and physics. Conference program: Invited lectures, contributed presentations, poster session, problem session and software demonstrations. Official languages: The official languages of the conference are English and French. Invited Speakers: George Andrews (USA; not yet confirmed) Jonathan Borwein (Canada) Andreas Dress (Germany) Tony Guttmann (Australia) Mark Haiman (USA) Michel Mendes France (France) Rodica Simion (USA; not yet confirmed) Anatoliy Vershik (Russia) One more speaker to be announced. Call for papers and posters: Authors are invited to submit extended abstracts of at most twelve pages before November 15, 1996. Preferred way of submission is by sending one postscript file by email to fpsac97@risc.uni-linz.ac.at. If an author is not able to send a postscript version of her/his extended abstract, four copies of the extended abstract should be mailed to Peter Paule, Chairman of the Program committee of FPSAC '97, RISC, Johannes Kepler Universitat, A-4040 Linz, AUSTRIA. The submitted papers should begin with a summary written in the two official languages of the conference (translations will be provided if necessary). Authors should indicate the mode of presentation which they consider appropriate for their paper: lecture or poster session. The notifications of acceptance or rejection are scheduled for the beginning of March 1997. The authors whose papers will have been accepted for a lecture or a poster presentation will have the possibility to submit a complete version of their work to a special issue of the journal "Discrete Mathematics," devoted to the conference FPSAC '97. The deadline for submission to the special issue is September 1, 1997. Open problem session: Contributions to the problem session are invited in advance of the conference dates. If possible, problems should be submitted by e-mail to the address fpsac97@risc.uni-linz.ac.at. Software demonstrations: Demonstrations of software relevant to the topics of the conference are encouraged. People interested in giving a software demonstration should submit a paper as described above, including the hardware requirements, before January 15, 1997, by email to fpsac97@risc.uni-linz.ac.at. Program committee: So far the list includes: Nantel Bergeron (Canada), Peter Paule (Austria; Chairman), David Bressoud (USA), Marko Petkovsek (Slovenia), Mireille Bousquet-Melou (France), Victor Reiner (USA), Omar Foda (Australia), Jeff Remmel (USA), Sergey Fomin (USA, Russia), Christophe Reutenauer (Canada), Ian Goulden (Canada), Bruno Salvy (France), Christian Krattenthaler (Austria), Volker Strehl (Germany; Chairman), Bernard Leclerc (France), Itaru Terada (Japan), Mark Noy (Spain), Dominic Welsh (England). Participant support: Limited funds are available for partial support of participants, in particular for students and scientists from Eastern countries. Requests should contain a letter of recommendation and include the estimated transportation and living expenses as well as the amount of support available from other sources. All requests should be sent in duplicate by January 15, 1997 to the following adress : Christian Krattenthaler, Chairman of the Organizing committee of FPSAC '97, Institut fur Mathematik, Universitat Wien, Strudlhofgasse 4, A-1090 Vienna, AUSTRIA. Location: The conference will take place at the Institut fur Mathematik of the Universitat Wien. The first talk is scheduled on July 14, 1997 at 9:00 a.m. Hotels: To be announced later. Further information: For any question, just write to fpsac97@nelly.mat.univie.ac.at. Organizing committee: Peter Kirschenhofer (Vienna), Christian Krattenthaler (Vienna; Chairman), Daniel Krob (Paris), Helmut Prodinger (Vienna). Registration: To be announced later. Topic #8 ----------------- OP-SF NET ------------------ July 15, 1996 From: Allesandro Di Bucchianico <sandro@win.tue.nl> Subject: Report on Umbral Calculus Workshop: MIT, April 22-23, 1996} A workshop on Umbral Calculus was held at M.I.T. on April 22--23 as an addition to the Rotafest (the celebration of Gian-Carlo Rota's 64th birthday). The workshop was organized by Daniel Loeb, Nigel Ray and Alessandro Di Bucchianico with much support from Rotafest organizer Richard Stanley and secretarial staff of M.I.T. The goal of this workshop was to give an overview of the development since Rota's seminal papers on the subject in the early seventies and to present new developments. Although Umbral Calculus is classified under combinatorics in the AMS classification, it has applications to several fields of mathematics, including special functions. We refer to Dynamical Survey 3 of the Electronic Journal of Combinatorics for more details. Talks were delivered (in chronological order) by Brian Taylor, Marilena Barnabei, Heinrich Niederhausen, Luis Verde-Star, Jet Wimp, George Andrews, Mourad Ismail, Miguel Mendez, William Chen, Daniel Loeb, Ottavio D'Antona, Nigel Ray, Philip Feinsilver, Henryk Gzyl, Alessandro Di Bucchianico, and Jack Freeman. Below we will briefly summarize those talks related to orthogonal polynomials or special functions. - Brian Taylor presented joint work with Gian-Carlo Rota on a rigorous foundation of the classical umbral calculus of the previous century. Brian illustrated the high computational power of this approach by giving one-line proofs of properties of the Bernoulli polynomials. - Luis Verde-Star presented a very general Hopf algebra structure that he showed to be the underlying structure of many analytic methods such as Laplace transforms etc. As a nice application he gave a one-line calculation without induction of the integral \int_{0}^{\infty} x^n e^{-x} dx. - Jet Wimp showed how cut operators on Laurent series form a powerful tool for proving hypergeometric identities. - Mourad Ismail discussed various properties of the Askey-Wilson operators. - William Chen showed how elementary identities and a clever use of the operator \vartheta: p(x) \mapsto {p(qx)-p(x)}/x yields many basic hypergeometric identities and transformations. - Daniel Loeb presented ongoing joint research with Gian-Carlo Rota and Alessandro Di Bucchianico on a basis-free infinite-dimensional umbral calculus. As a first application, he showed how to calculate integrals of the form \int_{||x||=1} x_1^{d_1} ... x_n^{d_n} d\mu(x), where \mu is an orthogonally invariant measure. - Philip Feinsilver showed results from joint research with Rene Schott on linearization and abelianization of Lie algebras with various applications to hypergeometric functions. - Alessandro Di Bucchianico gave an umbral approach to variance functions of exponential families (joint work with Daniel Loeb). He gave a new proof of the following theorem of Philip Feinsilver: The variance function of a natural exponential family is a polynomial of degree at most 2 if and only if the associated Sheffer polynomials are orthogonal. - Jack Freeman showed an algebraic transform method that can be used to find orthogonal polynomials (with respect to a linear functional) within a certain class. He applied his method to the classes of Sheffer polynomials and Chebyshev-like polynomials. The workshop was attended by approximately 40 to 60 people. Alessandro Di Bucchianico Eindhoven University of Technology Topic #9 ----------------- OP-SF NET ------------------ July 15, 1996 From: Juri M.Rappoport <jmrap@landau.ac.ru> Subject: Report on Chebyshev Memorial Conference The Mechanics-Mathematics Faculty of Moscow State University, the Chebyshev Fund and the Institute of Nuclear Power Engineering (Obninsk) held an International Conference "Modern Problems in Mathematics and Mechanics" - CHEB96 in honour of the great Russian mathematician Pafnutij L'vovich Chebyshev's 175th anniversary. The conference was held in the main high-rise building of the Moscow State University from 14th to 19th of May 1996 and was partly sponsored by Moscow State University and the Russian Foundation of Fundamental Investigations. The Organizing Committee of the Conference was chaired by Academician of the Russian Academy of Sciences, Professor N.S. Bahvalov. Among the general sections of the conference we mention the sections on approximation theory and computational mathematics. On Chebyshev's birthday (May 16th), a visit to his native land, grave and museum was organized. The excursion to the museum was very interesting because it is situated now in a country school. A special performance devoted to mathematics and Chebyshev was prepared by schoolboys and schoolgirls and their teachers. Among the participants in these events were leading and famous Russian mathematicians: the former President of the Russian Academy of Sciences, Academician Professor G.I. Marchuk and Academician Professor S.M. Nikolski. Some relatives of Chebyshev visited the conference also, and it was possible to obtain their autographs. About 280 participants attended the conference. I'd like to mention the following reports which were made to the Conference: Academician Professor N.S. Bahvalov "The use of Chebyshev polynomials in computational mathematics", Professor Y. Matiasevich "Computer evaluation of generalized Chebyshev polynomials" and the report of the author of this column: "The use of Chebyshev polynomials in the computation of special functions". Juri M.Rappoport Moscow, Russian Academy of Sciences~e Topic #10 ----------------- OP-SF NET ------------------ July 15, 1996 From: Charles F. Dunkl <cfd5z@Virginia.EDU> Subject: CRM Workshop on Special Functions: CRM, May 21-26, 1996 This is a report on the Atelier sur les methodes algebriques et q-fonctions speciales (Workshop on the Algebraic Methods and q-special Functions), Centre de recherches mathematiques, Universite de Montreal, Montreal, Quebec, Canada, May 21-26, 1996. Monday, May 20, was a national holiday in Canada (Victoria Day) and this pushed the start of the workshop to Tuesday morning. Luc Vinet, co-organizer with Pavel Winternitz and director of the Centre, opened the session at 9:00, welcomed the participants and dedicated the workshop to the memory of Waleed Al-Salam, who passed away April 14 of this year (see OP-SF NET Issue 3.3, Topic #7 for an obituary). There were approximately seventeen invited speakers who gave hour-long talks; there were about fourteen who contributed half-hour talks. David and Gregory Chudnovsky were invited but were unable to attend and their time on the program was taken by other events. Sergei Suslov was invited, could not attend, but Dick Askey delivered his lecture. Dick also gave his own lecture (more details later). There was indeed a heavy emphasis on q-special functions, both of one-variable Askey-Wilson type and of several-variable Macdonald type. The algebraic methods were highly refined and sophisticated, mostly based on root systems and associated mathematical objects such as double affine Hecke algebras. Here is an alphabetical list of the invited speakers and the titles of their lectures: - George Andrews: Plane partitions and MacMahon's partition analysis - Richard Askey: An inequality of Vietoris and some related hypergeometric sums - Ivan Cherednik: Spherical difference Fourier transform - Charles Dunkl: Intertwining operators and polynomials associated with the symmetric group - Pavel Etingof: Macdonald eigenvalue problem and representations of quantum gl(n) - Roberto Floreanini: Quantum algebras and generalized hypergeometric functions - Adriano Garsia: Polynomiality of the Macdonald q,t-Kostka coefficients: a short proof - Mourad Ismail: Moment problems and orthogonal polynomials - Tom Koornwinder: The A_1-tableau of Dunkl-Cherednik operators - Boris Kupershmidt: The great powers of q-calculus - Ian Macdonald: Symmetric and non-symmetric orthogonal polynomials - David Masson: Contiguous relations, continued fractions and orthogonality: a ten year journey up the Askey chart - Willard Miller, Jr.: Tensor products of q-superalgebras and q-series identities - Masatoshi Noumi: Raising operators for Macdonald polynomials - Eric Opdam: Spectral analysis of Hecke algebras - Siddhartha Sahi: Recent results on Jack polynomials and Macdonald polynomials - Dennis Stanton: q-orthogonal polynomials as moments - Sergei Suslov (talk delivered by R. Askey): Some basic hypergeometric series and q-Bessel functions. Contributed talks were given by N. Atakishiyev, R. Chouikha, P. Floris, A. Grunbaum, K. Kadell, M. Kapilevich, J. LeTourneux, K. Mimachi, A. Odzijewicz, V. Spiridonov, A. Strasburger, N. Takayama, F. van Diejen, L. Vinet. Ian Macdonald started his lecture Tuesday morning and finished it on Wednesday. Dick Askey gave an extra half-hour talk on Wednesday containing an overview of Askey-Wilson polynomials. Tom Koornwinder used another one of the hours originally scheduled for the Chudnovsky's to discuss Rene Swarttouw's web site which gives access to a vast collection of formulas and references for the polynomials contained in the Askey tableaux (q = 1 and general q). The URL is: http://www.can.nl/\symbol{126}renes/index.html ; see also the software announcement in Topic #12 There were approximately sixty participants; as well some members of the Centre dropped in on the lectures. The languages spoken at coffee and in the hallways appeared to be English, Russian, French, Japanese, Dutch, Polish. The weather was mostly delightful with a few evening showers. The University is in a scenic location near the Mont Royal; the Pavillon Andre-Aisenstadt, which houses the Centre, is a beautifully designed and equipped academic building, with a wonderful view of the northwest of the city. Ian Macdonald gave the first lecture on Tuesday, Adriano Garsia gave the last one on Saturday, thus bracketing an intense period of leading-edge mathematics. It was generally agreed that the workshop was excellent both in organization and inspiration to the participants for future work. At the conclusion all applauded and thanked the organizers for this exciting conference. Charles Dunkl Topic #11 ----------------- OP-SF NET ------------------ July 15, 1996 From: Walter Van Assche <walter@wis.kuleuven.ac.be> Subject: Special Functions at the International Joint Mathematics Meeting: Antwerp, Belgium, May 22-24, 1996 >From May 22 to 24, the American Mathematical Society and the Mathematical Societies of the Benelux countries (Belgium, The Netherlands, and Luxemburg) had a joint meeting in Antwerp, Belgium. The meeting was rather successful, with about 500 people attending the conference. In the mornings there were plenary speakers. Special sessions and contributed papers were planned during the afternoons, with about 12 parallel sessions each afternoon. There was a special session on Wednesday May 22 on "Special Functions", organized by Marcel G. de Bruin and Walter Van Assche. About 20 people attended this special session. The first two talks were on Sobolev orthogonal polynomials. Marcel de Bruin talked about "continuous Sobolev-Laguerre polynomials and their generalized continued fractions". He looked at orthogonal polynomials for the inner product <f,g> = \int_0^\infty f(x)g(x) x^\alpha e^{-x} dx + \lambda \int_0^\infty f'(x)g'(x) x^\alpha e^{-x} dx. The monic orthogonal polynomials satisfy a four-term recurrence relation, and from this Marcel de Bruin studied the corresponding generalized continued fraction and the connection with simultaneous rational approximation. Henk G. Meijer then talked about "coherent pairs for Sobolev polynomials". Coherent pairs were introduced by Iserles et al. in 1991. If (\mu_1,\mu_2) is a coherent pair of measures, then the Sobolev orthogonal polynomials for the inner product <f,g> = \int f(x)g(x) d\mu_1(x) + \lambda \int f'(x)g'(x) d\mu_2(x) can be studied in detail starting from the orthogonal polynomials for the measure \mu_1 (or the measure \mu_2). The pair (\mu,\mu), where d\mu(x) = x^\alpha e^{-x} dx on [0,\infty), studied by de Bruin in the previous talk, is an example of a coherent pair. Meijer recently succeeded in finding all coherent pairs. He showed that in a coherent pair, one of the measures needs to be classical (Jacobi, Laguerre, or Hermite), and then the other measure is a perturbation of the classical measure (addition of a point mass, multiplication or division by a polynomial of degree one). Herman Bavinck then talked about "A new result for Laguerre, Charlier, and Meixner polynomials". He showed that for all x, \alpha \in \C \sum_{k=j}^i k^s L_{i-k}^(-\alpha-i-1) (-x) L_{k-j}^(\alpha+j) (x) = 0, for all i,j,s \in N, provided that i > 2s+j, and gave similar results for Meixner polynomials and Charlier polynomials. The next two talks were on multiple hypergeometric series. First Joris Van Der Jeugt talked on "Transformation and summation formulas for multiple hypergeometric functions". His starting point is the quantum theory of angular momentum. He recalled the 3-j and the 6-j coefficients and indicated that they are related to the Hahn polynomials and the Racah polynomials in the Askey table. Then he looked at the 9-j coefficients, which he considered as an inspiring source of obtaining new relations between hypergeometric series, in particular the double hypergeometric Kampe de Feriet series F^{0:3;3}_{1:1;1} of unit argument. Next Michael Schlosser presented "multidimensional matrix inversions and A_r and D_r basic hypergeometric series" (joint work with Ch. Krattenthaler). They computed the inverse of a specific infinite r-dimensional matrix, which they then applied to obtain many new identities for multidimensional hypergeometric series. Finally the remaining three talks were on computer algebra and orthogonal polynomials. Our newsletter editor Wolfram Koepf gave two talks. The first dealt with "efficient computation of orthogonal polynomials in computer algebra". He mentioned various ways to compute orthogonal polynomials (explicit series, generating functions, Rodrigues formula, differential equation, recurrence relation, determinants) and showed how each of these methods performs on a computer algebra system (Maple, Mathematica, Reduce, MuPad), using the Chebyshev polynomials as a guiding example. Then he presented "orthogonal polynomial identities in Maple V.4". Zeilberger's algorithm gives recurrence relations and differential equations for hypergeometric sums/integrals and is therefore quite useful for orthogonal polynomials in the Askey table. Wolfram gave an overview of Maple's new capabilities. This was demonstrated on the computer. Wolfram implementations were used by Rene Swarttouw in his "computer implementation of the Askey-Wilson scheme". Rene is presently working on a project of creating an interactive book on orthogonal polynomials in the Askey-Wilson scheme, with facilities for symbolic manipulation of formulas. He first showed a clickable Askey-Wilson table, where properties of each family of orthogonal polynomials can be found just by clicking with the mouse on the required family. Also limit transitions can be found by clicking the relevant arrows. Rene also worked on an interface with Maple, allowing anyone to generate recurrence relations and differential equations of any system of orthogonal polynomials in the Askey-Wilson table, even after an affine transformation and rescaling. Finally he showed that the reverse is also under construction: given the coefficients of a three-term recurrence relation, the user will be informed with which particular system of orthogonal polynomials one is dealing. Rene Swarttouw's project can be seen on internet at homepage http://star.cs.vu.nl/~rene/ . (See the next Topic - Eds.) Walter Van Assche Topic #12 ----------------- OP-SF NET ------------------ July 15, 1996 From: Rene Swarttouw <rene@cs.vu.nl> and Tom Koornwinder <thk@fwi.uva.nl> Topic: A computer implementation of the Askey-Wilson scheme This is an update of the information on the project "A computer implementation of the Askey-Wilson scheme" (see OP-SF Net 3.1, topic #16 and OP-SF Net 3.3, topic #11). During the period January - June 1996, Rene Swarttouw has worked on this project at RIACA in Eindhoven, The Netherlands. Tom Koornwinder was an adviser for this project. Starting July 1, 1996 Rene Swarttouw is back at the Free University, Amsterdam, and his main task will be in another direction. The project will be continued in a lower gear by Swarttouw and Koornwinder until new funds have been raised and new staff has been hired for a follow-up of the project. To see the latest output of the project, it is best to visit Rene Swarttouw's home page http://star.cs.vu.nl/~rene/ and then follow the link to the Askey-Wilson scheme project. You will find there the interactive book form of the Koekoek-Swarttouw report "The Askey-scheme of hypergeometric orthogonal polynomials and its q-analogue", both in a hypertex version and in a netscape version. You will also find there a link to CAOP, a package for calculating formulas for orthogonal polynomials belonging to the Askey-scheme by Maple. You can also directly approach this package at WWW: http://www.can.nl/~demo/CAOP/CAOP.html With the present version users can compute recurrence relations, differential and difference equations or make a plot of every polynomial in the Askey scheme, without having Maple installed on their own computer. It is also possible to multiply the polynomial by a scaling function, to change the argument and to give values to the parameters by filling out a form, before doing the calculation. As an extra option the user can choose the layout of the output: prettyprint, lineprint or LaTeX. The latter two options make it possible to insert the output in another Maple worksheet respectively in a LaTeX document by a simple mouse-action. Furthermore there are some help pages available for users who are not familiar with Maple. They can be viewed simultaneously while filling in the form. Finally, Tom Koornwinder and Rene Swarttouw are writing together a procedure in Maple, called rec2ortho, which uses the coefficients of a three-term recurrence relation for orthogonal polynomials as input, and which returns the explicit system of OP's solving these recurrence relations, provided it belongs to the Askey scheme or q-Askey scheme. Eventually, this should also be extended to associated OP's and other explicit OP's which are not in the (q-)Askey scheme. At the moment, the procedure only covers the OP's in the Askey scheme (q=1) up to the level of 2 parameters (Jacobi, Meixner, etc.). For optimal usage of the procedure you need Maple V, Release 4 (already available for Windows and Macintosh, coming out for Sun workstation soon). The procedure rec2ortho, as well as a test file rec2orthotest, can be obtained by anonymous ftp from ftp.fwi.uva.nl cd pub/mathematics/reports/Analysis/koornwinder/rec2ortho.dir Rene Swarttouw <rene@cs.vu.nl> and Tom Koornwinder <thk@fwi.uva.nl> welcome questions, comments and suggestions about this project. Topic #13 ----------------- OP-SF NET ------------------ July 15, 1996 From: Editors <tkk@uva.fwi.nl>, <muldoon@yorku.ca> Subject: Obituary: Lawrence C. Biedenharn, Jr. This obituary is based on material supplied by Stephen C. Milne, to supplement a notice by Monte Basgall (http://www.dukenews.duke.edu/Latest/Biden). Lawrence C. Biedenharn Jr., 73, a longtime member of Duke University's physics faculty and an internationally known researcher in theoretical physics, died Monday, Feb. 12, in Austin, Texas, after a lengthy battle with cancer. He had made his home in Texas in recent years. Biedenharn became the youngest full professor on the Duke faculty -- at age 38 -- when he was appointed in 1961. He remained at Duke until 1993, when he retired as James B. Duke professor of physics and subsequently moved to the University of Texas at Austin as adjunct professor. A native of Vicksburg, Miss., he received both his bachelor's degree and his Ph.D. from the Massachusetts Institute of Technology and served in World War II as a Signal Corps officer and later on the staff of Gen. Douglas MacArthur in Japan. Serving on the faculties of Yale University and Rice University before coming to Duke, he published six books and hundreds of research articles in the fields of nuclear physics and later mathematical physics. He also edited the Journal of Mathematical Physics for many years. Biedenharn, Holman, and Louck showed how the classical work on ordinary hypergeometric series is intimately related to the irreducible representations of the compact group SU(2). Similarly, they found U(n) multiple series generalizations of one-variable hypergeometric summation and transformation theorems by comparing two ways of computing the matrix elements of multiplicity free Wigner and Racah coefficients in U(n). This work was done in the context of the quantum theory of angular momentum and the special unitary groups SU(n). This work motivated the far-reaching q-analogs that Milne, Gustafson, and their co-workers subsequently found. Applications of this later work include unified proofs of the Macdonald identities, constant term identities, multiple q-beta integrals, U(n+1) and symplectic generalizations of the Bailey Transform and Bailey Lemma, classical matrix inversion results, numerous classical summation and transformation theorems for one-variable q-series, Rogers-Ramanujan identities, and, finally, new infinite families of identities for sums of squares in classical number theory. His book about "Quantum Group Symmetry and q-tensor Algebras", jointly written with M.A. Lohe, appeared recently; see Issue 3.2, Topic #9. Biedenharn's work continues to motivate much of this recent research in multivariable orthogonal polynomials, special functions, and their applications. Lawrence C. Biedenharn is survived by his wife of 45 years, Sarah; his son John; daughter Sally; and two grandchildren. Topic #14 ----------------- OP-SF NET ------------------ July 15, 1996 From: Richard Askey <askey@math.wisc.edu> Subject: Waleed Al-Salam (Editors' Note: We noted the passing of Waleed Al-Salam in Issue 3.3, Topic #7; Dick Askey has kindly provided the following additional remarks.) One of the pleasures in visiting Edmonton was being able to talk with Waleed Al-Salam. The conversations could be on mathematics, but just as frequently would be on other topics. What he did not tell me about one visit is something which shows his character. It was a cold winter, and he met me at the downtown airport after a flight from Calgary. He never mentioned the sequel. I was wearing a fur hat bought in Moscow, and carrying a bag from the International Congress of Mathematicians in Moscow in 1966. There was a Russian hockey team in Calgary. When this Russian looking man with a Russian hat and bag flew to the downtown airport in Edmonton without the RCMP having been notified, they called to Edmonton to ask that this be checked out. I did not notice them watching, nor do I think Waleed did, but a few days later there were questions asked about him and me at the Mathematics Department. It was only many years later that someone else told me about this. Waleed did not, since he did not want me to feel bad about his being investigated. That was typical. He was a gentleman. Waleed was also a scholar. On another trip to Edmonton, I talked about some orthogonal polynomials which had first been found by L.J. Rogers, although Rogers was not aware they were orthogonal. These polynomials had been rediscovered twice around 1940, so were known to be orthogonal. However, they were not well known. In discussion after the talk, Waleed said that these polynomials reminded him of some polynomials found by Bill Allaway in his thesis. Waleed had sent me this thesis, but I had not read it carefully, so asked him to bring in a copy the next day. Sure enough, Allaway had rediscovered these polynomials once again, but had been more careful in his work than the two who had found these polynomials about 1940. There was a special case where division by zero ocurred unless you were careful, and Allaway had been. These polynomials which had been missed by others are now called sieved polynomials and they have played an important role in a few developments of the general theory of orthogonal polynomials. Both of Waleed's Ph.D. students, Bill Allaway and Mourad Ismail, got a good start in mathematics from the problems which they got from him. I handled the paper Waleed and Ted Chihara wrote on what are now called the Al-Salam-Chihara polynomials. This was for SIAM Journal on Mathematical Analysis, so there should be some indication that the work would have applications to problems in science or engineering, or some other applied area. They had none, but the polynomials seemed so natural that there was no question in my mind that they would eventually have many applications. We now know where they live. They are a very important q-extension of Laguerre and Meixner polynomials. The problem Al-Salam and Chihara solved was a very natural extension of the problem solved by Meixner in the middle 1930s when he found Meixner polynomials and what I call Meixner-Pollaczek polynomials. These last arise in the representations of SU(1,1), and so in theoretical physics. Now that quantum groups seem to have appeared in physics, it is very likely that these polynomials of Al-Salam and Chihara will arise in problems in physics, just as the polynomials found earlier by Al-Salam and Carlitz have arisen in the study of q-harmonic oscillators. These last polynomials are natural q-extensions of Charlier polynomials. They also extend the continuous q-Hermite polynomials of L.J. Rogers. The polynomials of Rogers have a very interesting combinatorial structure associated with them, and extensions of this to the Al-Salam-Carlitz polynomials is currently being developed. Waleed Al-Salam had a remarkable eye for formulas, and the ability and energy to find a number of important ones. The polynomials mentioned above are very appropriately named, and these and some other results found by him will keep his name in the minds of many people who never had the joy of knowing him. Those of us who did will remember him as well as his work, and miss him the more for this. Richard Askey Univ. of Wisconsin-Madison Topic #15 ----------------- OP-SF NET ------------------ July 15, 1996 From: Wolfram Koepf <koepf@ZIB-Berlin.DE> Subject: Book Report (Feinsilver and Schott) Algebraic Structures and Operator Calculus II: Special Functions and Computer Science, Mathematics and its Applications 292 By Philip Feinsilver and Rene Schott Kluwer Academic Publishers, Dordrecht, The Netherlands, July 1994, 160 pp., hardbound, ISBN 0-7923-2021-X, Dfl. 120.00/ US$ 70.00 This is the second of three volumes which present, in an original way, some of the most important tools of applied mathematics in areas such as probability theory, operator calculus, representation theory, and special functions, used in solving problems in mathematics, physics and computer science. This second volume---Special Functions and Computer Science---presents some applications of special functions in computer science. It largely consists of adaptations of articles that have appeared in the literature, but here they are presented in a format made accessible for the non-expert by providing some context. The material on group representation and Young tableaux is introductory in nature. The algebraic approach of Chapter 2 is original to the authors and has not appeared previously. Similarly, the material and approach based on Appell states, so formulated, is presented here for the first time. The solutions are tackled with the help of various analytical techniques, such as generating functions and probabilistic methods and insights appear regularly. Contents: Preface Introduction Basic Data Structures Data Structures and Orthogonal Polynomials Applications of Bessel Functions and Lommel Polynomials Fourier Transform on Finite Groups and Related Transforms Young Tableaux and Combinatorial Enumeration in Parallel Processing References Index Wolfram Koepf Topic #16 ----------------- OP-SF NET ------------------ July 15, 1996 From: Alan L. Schwartz <schwartz@arch.umsl.edu> Subject: Call for Questions For several years, William Connett and I have organized summer research groups designed to give a mathematical experience to undergraduates and high school students. A typical activity would be to use a computer algebra system to test conjectures about orthogonal polynomials or produce interesting graphics. We would be very grateful for any suggestions for projects. Topic #17 ----------------- OP-SF NET ------------------ July 15, 1996 From: Angelo Melino <melino@epas.utoronto.ca> Subject: Problem My research has led me to the integral (1) int{ y*sinh(Pi*y)*K_{iy}(r)* exp(-t*y^2/2), y=0..infinity) In words, the value of this integral is (proportional to) the inverse Kontorovich-Lebedev transform of f(y) := exp(-t*y^2/2). I've searched extensively through books of Tables etc. to find a value for this definite integral without any luck. The original integral appeared in a paper by Marc Yor, "On some exponential functions of Brownian Motion", Adv. Appl. Prob. 24, 509-531 (1992). It arises in an expression for the density of the integral of a geometric Brownian motion, conditional on its (initial and) terminal values. Yor defines the integral (defined for r>=0 and t>0) Theta_r(t) := r/sqrt(2*(Pi^3)*t)*exp(Pi^2/(2*t) * int( exp(-x^2/(2*t))*sin(Pi*x/t)*exp(-r*cosh(x))*sinh(x), x=0..inf) I can show that this integral can be expressed as Theta_r(t) := Pi^(-2)*(the integral in (1)) I'm also able to compute the Laplace transform of this integral Laplace (Theta_r(t)) := int( Theta_r(t)*exp(-r*p), r=0..inf) = a/( sqrt(2*Pi*t^3)*sinh(a)) * exp(-a^2/(2*t)) where a:=cosh(p). Topic #18 ----------------- OP-SF NET ------------------ July 15, 1996 From: The Editors <tkk@uva.fwi.nl>, <muldoon@yorku.ca> Subject: Changes of Address, WWW pages. etc. (1) Charles Dunkl's WWW page URL is changed to: http://www.math.virginia.edu/~cdf5z/home.html though there is still a link from the old location. (2) From Paul Floris: As from the 1st of July I have moved to Louis Pasteur University in Strasbourg, the exact coordinates of which you find below. This change of address is temporary and remains valid until the end of December of this year. However, you can also still reach me at floris@wi.leidenuniv.nl. Paul G.A. Floris I.R.M.A. Universite Louis Pasteur 7, rue Rene Descartes F-67084 Strasbourg Cedex FRANCE floris@irma.u-strasbg.fr (3) From Dennis Stanton The machines names s1,s2,s3, and s7 will no longer exist at math.umn.edu. If your e-mail aliases contain these names, mail will likely bounce. You should change your aliases to: name@math.umn.edu for example, stanton@math.umn.edu, white@math.umn.edu. (4) New address of Rene' Swarttouw: Vrije Universiteit Amsterdam Fac. Mathematics and Informatics De Boelelaan 1081 1081 HV Amsterdam The Netherlands Tel: +31 (0)20 4447787 E-mail: rene@cs.vu.nl URL: http://star.cs.vu.nl/~rene As a consequence some of the WWW addresses of the Askey-Wilson-scheme project have moved. The best way to keep up to date is to go to Rene' Swarttouw's Home Page and follow the links to the Askey-Wilson-scheme project there. (5) Walter Van Assche informs us that his WWW page URL is changed to: http://www.wis.kuleuven.ac.be/wis/applied/walter.html Topic #19 ----------------- OP-SF NET ------------------ July 15, 1996 From: OP-SF Net editor <thk@fwi.uva.nl> Subject: ftp site for papers in Orthogonal Polynomials and Special Functions Hans Haubold's ftp archive for preprints in the area of Orthogonal Polynomials and Special functions is the continuation of Waleed Al-Salam's preprint archive. One can approach the archive by anonymous ftp to unvie6.un.or.at, directory siam, or at the WWW address ftp://unvie6.un.or.at/siam . See the file 00contents.ftpsite in the submissions directory for the contents (titles, authors, filenames) of the directories opsf and abstracts. This list of contents is in chronological order of submission. The most recent contributions will just reside as files in the submissions directory, and are not yet documented in the list of contents. Hans Haubold is sending regular info about new submissions to a large mailing list. Please contact him <haubold@Relay1.Austria.EU.net> if you want to be added to this mailing list or if your email address on the list is no longer correct. Since OP-SF Net 3.3 appeared, there have been no updates about new submissions to the archive. However, the submissions directory contains three new files which interested persons might like to download: - kuznetsov_sklyanin... (May 7, 1996) Separation of variables for A2 Ruijsenaars model and new integral representation for A2 Macdonald polynomials, by V.B. Kuznetsov and E.K. Sklyanin (31 pages, LaTex, no figures) - elderivations11-20-95 (May 20, 1996) Elementary derivations of summation and transformation formulas for q-series, by George Gasper (Postscript, 16 pages) - diejen-stokman.tex (July 1, 1996) Multivariable $q$-Racah polynomials, 38 pages LaTeX (with AMS style files), by Jan Felipe van Diejen and Jasper V. Stokman Topic #20 ----------------- OP-SF NET ------------------ July 15, 1996 From: OP-SF Net editor <thk@fwi.uva.nl> Subject: Obtaining back issues of OP-SF Net and submitting contributions to OP-SF Net and Newsletter Back issues of OP-SF Net can be obtained from ftp: ftp.fwi.uva.nl, in directory pub/mathematics/reports/Analysis/koornwinder/opsfnet.dir or WWW: ftp://ftp.fwi.uva.nl/pub/mathematics/reports/Analysis/koornwinder/opsfnet.dir or WWW: http://www.math.ohio-state.edu/JAT/DATA/OPSFNET/opsfnet.html Contributions to the OP-SF Net 3.5 should reach the email address poly@siam.org before September 1, 1996. The Activity Group also sponsors a Newsletter edited by Wolfram Koepf. Deadline for submissions to be included in the October 1996 issue is September 15, 1996. Please send your Newsletter contributions directly to the Editor: Wolfram Koepf Konrad-Zuse-Zentrum Heilbronner Str. 10, D-10711 Berlin, Germany tel.: +49-30-896 04-216 fax: +49-30-896 04-125, email: koepf@zib-berlin.de preferably by email, and in latex format. Other formats are also acceptable and can be submitted by email, regular mail or fax. Please note that submissions to the Newsletter (if not containing mathematics symbols or pictures) are automatically considered for publication in OP-SF Net, and vice versa, unless the writer requests otherwise. Previous issues of the Newsletter, but not the most recent one, can be obtained as dvi or PostScript files from Wolfram Koepf's WWW homepage: http://www.zib-berlin.de/~bzfkoepf/ or by anonymous ftp at ftp.zib-berlin.de in directory pub/UserHome/Koepf/SIAM In order to join the SIAM Activity Group on Orthogonal Polynomials and Special Functions, and thereby receive the Newsletter, you have to become a member of SIAM. The annual dues are $93 for SIAM plus $10 for the Group. Contact the email address join@siam.org . o - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - o - OP-SF Net is a forum of the SIAM Activity Group on - - Special Functions and Orthogonal Polynomials. - - We disseminate your contributions on anything of interest to the - - special functions and orthogonal polynomials community. This - - includes announcements of conferences, forthcoming books, new - - software, electronic archives, research questions, job openings. - o - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - o - Send submissions to: poly@siam.org - - Send address changes to: poly-request@siam.org - - Get back issues by ftp from: ftp.fwi.uva.nl, in directory - - pub/mathematics/reports/Analysis/koornwinder/opsfnet.dir - - WWW home page of this Activity Group: - - http://www.math.yorku.ca/Who/Faculty/Muldoon/siamopsf/ - - Information on joining SIAM - - and this activity group: service@siam.org - o - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - o - The elected Officers of the Activity Group are: - - Charles Dunkl, Chair - - Tom H. Koornwinder, Vice Chair and OP-SF Net editor - - Nico M. Temme, Secretary - - Willard Miller, Jr., Program Director - - The appointed officers are: - - Wolfram Koepf, Newsletter editor - - Martin Muldoon, Webmaster and OP-SF Net editor - o - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - o

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