Béla Szőkefalvi-Nagy
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Béla Szőkefalvi-Nagy (29 July 1913, Kolozsvár – 21 December 1998,
Szeged Szeged ( , ; see also #Etymology, other alternative names) is List of cities and towns of Hungary#Largest cities in Hungary, the third largest city of Hungary, the largest city and regional centre of the Southern Great Plain and the county seat ...
) was a Hungarian
mathematician A mathematician is someone who uses an extensive knowledge of mathematics in their work, typically to solve mathematical problems. Mathematicians are concerned with numbers, data, quantity, mathematical structure, structure, space, Mathematica ...
. His father, Gyula Szőkefalvi-Nagy was also a famed mathematician. Szőkefalvi-Nagy collaborated with
Alfréd Haar Alfréd Haar (; 11 October 1885, Budapest – 16 March 1933, Szeged) was a Kingdom of Hungary, Hungarian mathematician. In 1904 he began to study at the University of Göttingen. His doctorate was supervised by David Hilbert. The Haar me ...
and Frigyes Riesz, founders of the Szegedian school of mathematics. He contributed to the theory of Fourier series and approximation theory. His most important achievements were made in
functional analysis Functional analysis is a branch of mathematical analysis, the core of which is formed by the study of vector spaces endowed with some kind of limit-related structure (for example, Inner product space#Definition, inner product, Norm (mathematics ...
, especially, in the theory of Hilbert space operators. He was editor-in-chief of the '' Zentralblatt für Mathematik'', the '' Acta Scientiarum Mathematicarum'', and the '' Analysis Mathematica''. He was awarded the Kossuth Prize in 1953, along with his co-author F. Riesz, for his book ''Leçons d'analyse fonctionnelle.'' He was awarded the Lomonosov Medal in 1979. The Béla Szőkefalvi-Nagy Medal honoring his memory is awarded yearly by Bolyai Institute.


His books

* Béla Szőkefalvi-Nagy: ''Spektraldarstellung linearer Transformationen des Hilbertschen Raumes''.(German) Berlin, 1942. 80 p.; 1967. 82 p. * Frederic Riesz, Béla Szőkefalvi-Nagy: ''Leçons d'analyse fonctionnelle''. (French) 2e éd. Akadémiai Kiado, Budapest, 1953, VIII+455 pp. * * Ciprian Foiaş, Béla Szőkefalvi-Nagy: ''Analyse harmonique des opérateurs de l'espace de Hilbert''. (French) Masson et Cie, Paris; Akadémiai Kiadó, Budapest 1967 xi+373 pp. * Béla Szőkefalvi-Nagy, Frederic Riesz: ''Funkcionálanalízis''. Budapest, 1988. 534 p. (English: ''Functional Analysis'' (1990). Dover. )


His articles

* ''Diagonalization of matrices over H''. Acta Scientiarum Mathematicarum. Szeged, 1976 * ''On contractions similar to isometries and Toeplitz operators'', with Ciprian Foiaş. Ann. Acad. Scient. Fennicae, 1976. * ''The function model of a contraction and the space L’/H’'', with Ciprian Foiaş. Acta Scientiarum Mathematicarum. Szeged, 1979, 1980. * ''Toeplitz type operators and hyponormality'', with Ciprian Foiaş. Operator theory. Advances and appl., 1983. * ''Factoring compact operator-valued functions'', with authors. Acta Scientiarum Mathematicarum. Szeged, 1985. Sz.-Nagy, Béla (1954), "Ein Satz über Parallelverschiebungen konvexer Körper", Acta Universitatis Szegediensis, 15: 169–177, MR 0065942, archived from the original on 2016-03-04, retrieved 2013-05-19.


Award in his honour

In 1999, Béla Szőkefalvi-Nagy's daughter Erzsébet, established the Béla Szőkefalvi-Nagy Medal to remember her father. This medal is meant to recognize distinguished mathematicians who have published significant work in ''Acta Scientiarum Mathematicarum''. The following mathematicians have been awarded the medal: * C. Foiaş (2000) *K. Tandori (2001) *L. Leindler (2002) * G. Grätzer (2003) *F. Móricz (2004) *T. Ando (2005) *B. Csákány (2006) *H. Bercovici (2007) *E.T. Schmidt (2008) *H. Langer (2009) *P.A. Grillet (2010) *L. Zsidó (2011) *L. Kérchy (2012) *V. Müller (2013) *Z. Sebestyén (2014) *Pei Yuan Wu (2015) *G. Czédli (2016) * L. Lovász (2017) *P. Šemrl (2018) *L. Hatvani (2019) *F. H. Szafraniec (2020) *L. Stachó (2021) *Zs. Páles (2022) *A. Böttcher (2023) *J. Mashreghi (2024)


See also

* Sz.-Nagy's dilation theorem * Erdős-Nagy theorem


To the memory of Béla Szőkefalvi-Nagy

* Operator theory: advances and applications. Recent advances in operator theory and related topics : the Béla Szökefalvi-Nagy memorial volume : emorial conference held August 2–6, 1999 in Szeged/ eds. László Kérchy et al.
Basel Basel ( ; ), also known as Basle ( ), ; ; ; . is a city in northwestern Switzerland on the river Rhine (at the transition from the High Rhine, High to the Upper Rhine). Basel is Switzerland's List of cities in Switzerland, third-most-populo ...
;
Boston Boston is the capital and most populous city in the Commonwealth (U.S. state), Commonwealth of Massachusetts in the United States. The city serves as the cultural and Financial centre, financial center of New England, a region of the Northeas ...
;
Berlin Berlin ( ; ) is the Capital of Germany, capital and largest city of Germany, by both area and List of cities in Germany by population, population. With 3.7 million inhabitants, it has the List of cities in the European Union by population withi ...
: Birkhäuser Verlag, 2001. XLIX, 670 p. (Operator theory : advances and applications; 127.)


References

* D.P. Zhelobenko, Bela Szokefalvi-Nagy (obituary), ''Russian Mathematical Surveys'' 54 (1999), 819-822.
Szôkefalvi-Nagy Béla
(in Hungarian) Members of the Hungarian Academy of Sciences Mathematical analysts 20th-century Hungarian mathematicians 1913 births 1998 deaths Academic staff of Franz Joseph University Mathematicians from Austria-Hungary {{europe-mathematician-stub