A non-hypergeometric E-function

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Event details

Date 07.12.2022 14:1515:15  
Speaker Javier Fresàn (Ecole Polytechnique, Palaiseau, France)
Location
Category Conferences - Seminars
Event Language English

In a landmark 1929 paper, Siegel introduced the class of E-functions with the goal of generalising the transcendence theorems for the values of the exponential. E-functions are power series with algebraic coefficients subject to certain growth conditions of arithmetic nature that satisfy a linear differential equation. Besides the exponential, examples include Bessel functions and a rich family of hypergeometric series. Siegel asked whether all E-functions are polynomial expressions in these hypergeometric series. I will explain why the answer is negative and a possible amendment to Siegel's question in the form "all E-functions come from exponential motives". This is a joint work with P. Jossen.

Practical information

  • Informed public
  • Free

Organizer

  • Eva Bayer et Arthur Forey

Contact

  • Monique Kiener (if you want to attend to the seminar by zoom, please contact me, and I'll give you the link)

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