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Steven Gaal

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Nationality
  
Hungarian

Name
  
Steven Gaal


Role
  
Mathematician

Fields
  
Mathematician

Born
  
February 22, 1924 (age 100) Hungary (
1924-02-22
)

Institutions
  
Centre National del la Recherche Scientifique Yale Princeton University of Minnesota

Books
  
Linear analysis and representation theory, Point Set Topology

Residence
  
Hungary, France, United States of America

Doctoral advisor
  
Frigyes Riesz, Lipot Fejer

Steven Alexander Gaal (February 22, 1924 – March 17, 2016) (also known as István Sándor Gál or I. S. Gál) was a Hungarian-American mathematician and Professor of Mathematics at the University of Minnesota-Minneapolis.

Contents

Education

Gaal received his Ph.D. under Frigyes Riesz and Lipót Fejér in 1947, although at the time, graduate study in Hungary did not exist in the formal way it is thought of today. There were no formalities of prelims, qualifying exams, or even thesis advisor or tuition. After World War I, Hungary was dismembered and the Austro-Hungarian monarchy ended. Two thirds of Hungary's territory was given to other states, some existing, others created and since vanished. Under these conditions, only few higher education faculty could be appointed and students had to learn only from books or one or two old sick professors. Nevertheless, doctoral students managed to create publishable theses. Gaal's thesis problem had its origin in a letter Paul Erdős wrote to Pál Turán, in which he mentions a prize problem posed by the Netherlands Mathematical Society. Gaal solved it and with Erdős jointly published the solution.

Career

Gaal later went to Paris, where he was employed by the CNRS (Centre National del la Recherche Scientifique) at the rank of attaché de recherché. His supervisor was Jean Favard with higher supervisor Jacques Hadamard. Gaal met many leading French mathematicians at the CNRS, including Jean Leray and both Élie and Henri Cartan. After emigrating to the United States, he held positions at Yale and Princeton before joining the faculty of the School of Mathematics at the University of Minnesota. Atle Selberg was instrumental in bringing Gaal to the Institute for Advanced Study in Princeton, New Jersey. While in Princeton, Gaal met Albert Einstein, though the two did not work together. It also was in Paris that Gaal had first met Paul Erdős. Seven years later, they wrote two more joint papers. Over the years, Gaal met Erdős on a number of other occasions, including his last visit to Minneapolis on the invitation of Carleton College, who sponsored his visit. Robert Langlands has cited Gaal's influence in his early investigations of zeta functions and Eisenstein series. Gaal's former wife, Lisl Gaal (originally Lisl Novak), is an accomplished mathematician in her own right and is well known for her text Classical Galois Theory. In 2004, Gaal was honored at the Hungarian Academy of Sciences 80th anniversary as one of the "big five" most distinguished Hungarian mathematicians. The other honorees included Janos Horvath, János Aczél, Ákos Csaszar and László Fuchs. Gaal gave a talk entitled "Mikor periodikus egy Fibonacci-sorozat? – When is a Fibonacci sequence periodic?"

References

Steven Gaal Wikipedia