Ernst Sigismund Fischer

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Ernst S. Fischer
ErnstFischer 1920 MFO9271.jpg
ca. 1920
Born(1875-07-12)12 July 1875
Died14 November 1954(1954-11-14) (aged 79)
NationalityAustria
Alma materUniversity of Vienna
Known forRiesz–Fischer theorem
Spouse(s)Ellis Strauss
ChildrenUrsula
Scientific career
FieldsMathematics
InstitutionsUniversity of Cologne
ThesisZur Theorie der Determinanten (1899)
Doctoral advisorFranz Mertens
Leopold Gegenbauer

Ernst Sigismund Fischer (12 July 1875 – 14 November 1954) was a mathematician born in Vienna, Austria. He worked alongside both Mertens and Minkowski at the Universities of Vienna and Zurich, respectively. He later became professor at the University of Erlangen, where he worked with Emmy Noether.

His main area of research was mathematical analysis, specifically orthonormal sequences of functions which laid groundwork for the emergence of the concept of a Hilbert space.

The Riesz–Fischer theorem in Lebesgue integration is named in his honour.

He is the grandson of composer Karl Graedener.[1]

References[edit]

External links[edit]

  • O'Connor, John J.; Robertson, Edmund F., "Ernst Sigismund Fischer", MacTutor History of Mathematics archive, University of St Andrews.
  • Ernst Sigismund Fischer at the Mathematics Genealogy Project