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Analysis days in Sirius
October 26, 2021 10:00–10:45, Sochi, online via Zoom at 09:00 CEST (=08:00 BST, =03:00 EDT)
 


Constructive reconstruction of values of an algebraic function via polynomial Hermite–Padé $m$-system

A. V. Komlov

Steklov Mathematical Institute of Russian Academy of Sciences, Moscow

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Abstract: Let $f_0$ be a given germ of some algebraic function $f$ of degree $m+1$. We consider the following problem: how to reconstruct constructively the values of f in “as large a region as possible” on its Riemann surface $\mathfrak R$?
We introduce the polynomial Hermite–Padé $m$-system, which, in our case, is constructed from the tuple of the germs $[1, f_0,f_0^2,\dots,f_0^m]$. This system includes the Hermite–Padé polynomials of the first and of the second type.
We show how to reconstruct the values of $f$ on the first $m$ sheets of the so-called Nuttall partition of the Riemann surface $\mathfrak R$ via the polynomial Hermite–Padé $m$-system.

Language: English

Website: https://us02web.zoom.us/j/6250951776?pwd=aG5YNkJndWIxaGZoQlBxbWFOWHA3UT09

* ID: 625 095 1776, password: pade
 
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