B. Sz.-Nagy Medal

Béla Szőkefalvi-Nagy Medal

Year 2009

The Bolyai Institute of the University of Szeged is pleased to announce hereby that the Béla Szőkefalvi-Nagy Medal for the year 2009 has been awarded to

Heinz Langer, Emeritus Professor of the Technische Universität Wien, Wien, Austria.

Heinz Langer achieved significant, deep results in a wide range of mathematics, including spectral theory of operators in Krein spaces, self-adjoint operator polynomials, extension theory of symmetric operators, and block operator matrices. Since 1973, he has contributed seven definitive research papers to Acta Scientiarum Mathematicarum, two of them jointly with M.G. Krein. In particular, they introduced the notion of generalized Nevanlinna functions, widely used today, and exploited the method of B. Sz.-Nagy and A. Korányi to relate analytic functions and linear operators.

The Medal was presented to Heinz Langer at 14:00, December 16, 2009 in the Bolyai Institute. On this occasion he delivered a lecture ``Self-adjoint analytic operator functions: Local spectral function and inner linearization".