On the Structure of Solutions to the Key Gosper Equation in Problems of Symbolic Summation

Cover Page

Cite item

Full Text

Open Access Open Access
Restricted Access Access granted
Restricted Access Subscription Access

Abstract

The structure of polynomial solutions to the Gosper’s key equation is analyzed. A method for rapid “extraction” of simple high-degree factors of the solution is given. It is shown that in cases when equation corresponds to a summable non-rational hypergeometric term the Gosper’s algorithm can be accelerated by removing non-essential dependency of its running time on the value of dispersion of its rational certificate.

About the authors

E. V. Zima

Wilfrid Laurier University

Author for correspondence.
Email: ezima@wlu.ca
Waterloo, Canada

References

  1. Абрамов С.А. О суммировании рациональных функций // Ж. вычисл. матем. и матем. физ. 1971. Т. 11. № 4. С. 1071–1075.
  2. Gosper R.W., Jr. Decision procedure for indefinite hypergeometric summation // Proc. Nat. Acad. Sci. U.S.A., 75(1):40–42, 1978.
  3. Abramov S.A., Petkovšek M. Rational normal forms and minimal decompositions of hypergeometric terms // J. of Symbolic Computation, 33(5):521–543, 2002.
  4. Maple User Manual. Maplesoft, a division of Waterloo Maple Inc., 1996–2021.
  5. Абрамов С.А. Элементы компьютерной алгебры линейных обыкновенных дифференциальных, разностных и q-разностных операторов. М: МЦМНО, 2012.
  6. Moenck R. On computing closed forms for summations // In Proc. of the 1977 MACSYMA Users’ Conference, pp. 225–236, 1977.
  7. Petkovšek M. Hypergeometric solutions of linear recurrences with polynomial coefficients // J. of Symbolic C-omputation, 14(2):243–264, 1992.
  8. Lisonek P., Paule P., Strehl V. Improvement of the degree setting in Gosper’s algorithm // J. of Symbolic Computation, 16 (1993), 243–258.
  9. Pirastu R., Strehl V. Rational summation and Gosper-Petkovsšek representation // J. Symb. Comput., 20(5‑6):617–635, Nov. 1995.
  10. Zima E.V. Accelerating indefinite hypergeometric summation algorithms // ACM Commun. Comput. Algebra, 52(3):96–99, 2019.

Copyright (c) 2023 Е.В. Зима

This website uses cookies

You consent to our cookies if you continue to use our website.

About Cookies