Béla Szőkefalvi-Nagy

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Béla Szőkefalvi-Nagy, photo taken after 1970

Béla Szőkefalvi-Nagy (sometimes also briefly written Sz.-Nagy; born July 29, 1913 in Kolozsvár , † December 21, 1998 in Szeged ) was a Hungarian mathematician who dealt with harmonic analysis and functional analysis .

He was the son of the mathematician Gyula Szőkefalvi-Nagy (1887-1953), who also taught him. From 1942 Sz.-Nagy was Professor of Analysis at the University of Szeged . In 1964 he was visiting professor at Columbia University and in 1970 at Indiana University .

He dealt with Fourier analysis and the theory of linear operators in Hilbert spaces . With Frigyes Riesz he wrote two textbooks on functional analysis.

In 1979 he received the Lomonosov gold medal . He was editor of Acta Scientiarum Mathematicarum (1946 to 1981) founded by Frigyes Riesz and Analysis Mathematica. The Béla Szőkefalvi-Nagy Medal , named after him, has been awarded annually since 2000 by the Bolyai Institute of the University of Szeged for an important work by a mathematician in the journal Acta Scientiarum Mathematicarum . Szőkefalvi-Nagy was a foreign member of the Soviet Academy of Sciences and an honorary doctorate from the TU Dresden and the Finnish University of Turku .

In 1970 he was invited speaker at the International Congress of Mathematicians in Nice ( Sous-espaces invariants d´un operateur et factorisations de sa fonction characteristique ), 1958 in Edinburgh (Spectral sets and normal dilations of operators) and 1962 in Stockholm ( The "outer functions") and their role in functional calculus ).

Lajos Pukánszky is one of his doctoral students .


  • Spectral representation of linear transformations of Hilbert's space (= results of mathematics and its border areas. Vol. 5, 5). Springer, Berlin 1942.
  • with Ciprian Foias : Analyze harmonique des opérateurs de l'espace de Hilbert. Akadémiai Kiadó et al., Budapest a. a 1967.
  • with Frigyes Riesz : Leçons d'analysis fonctionelle. Akadémiai Kiadó, Budapest 1952
    German: Lectures on functional analysis (= university books for mathematics . Vol. 27). Translated by Siegfried Brehmer and Brigitte Mai. German Science Publishing House, Berlin 1956.

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