# Andrey Gonchar

Date of Birth: 11/21/1931

Age: 84

Place of birth: Leningrad

Citizenship: Russia

**Background**

Academic rank: Academician

Title: Professor

Scientific degree: Doctor of Physical and Mathematical Sciences (1964)

Speciality: 01.01.01 (mathematical analysis)

Date of Birth: 11/21/1931

The main topics of research:

Comprehensive analysis of the theory of approximations of analytic functions, continued fractions, Pade and their generalizations, orthogonal polynomials, potential theory.

For arbitrary compact subsets of the complex plane we found asymptotically exact solution of extreme problems Zolotarev. In terms of the asymptotic behavior of the fixed-line poles of the Pade table analytic function given by a power series, given a complete characterization of the meromorphic continuation of this function and its structural features. We prove the fundamental theorem that the absence of poles in the sequence of diagonal Pade approximants of power series in a region belonging to a rather broad class of domains, implies the holomorphic extendibility of a power series in this area.

Together with EA Rakhmanov developed a fundamentally new method for solving the classical problems ratsionalnyhapproksimatsy theory, based on the application of theoretical and potential vector equilibrium problems. In particular, this method in 1986, was completely solved the well-known problem with the asymptotic behavior of so-called Chebyshev constant for the exponential function (see. Http://mathworld.wolfram.com/).

Scientific biography:

He graduated from the Mechanics and Mathematics Faculty of Moscow State University. MV Lomonosov Moscow State University in 1954. Since 1964 he has worked at the Mathematical Institute. Russian Academy of Sciences.

In 1988-1991 gg. - Academician-Secretary of the Department of Mathematics of the USSR.

In the period of 1991-1998. - Vice-President of the Russian Academy of Sciences.

In 1992-1993. - President-organizer of the Russian Foundation for Basic Research.

Since 1987 - chief editor of "Mathematical Collection".

He was awarded two Orders of Red Banner of Labor (1975 and 1981). And the Order "For Services to the Fatherland" III stepeni.dostoen State (2000), and Demidov Prize (1998) and the Gold Medal of the MV Keldysh of the Russian Academy of Sciences (1993).

Invited speakers at the Congress of Mathematicians in Berkeley (USA) in 1986

Scientific results of Gonchar and Rakhmanov was recorded in 1987, among the best results of the year by the Academy of Sciences of the USSR.

Key publications:

AA Gonchar, On the convergence of Pade approximants for some classes of meromorphic functions // Mat. Sat. T. 1975. 97 (139),