Otto Hölder was a German mathematician known for his contributions to various fields of mathematics, particularly in analysis and number theory. He is perhaps best known for Hölder's inequality, which is a fundamental result in measure theory and functional analysis. Hölder's inequality provides a way to relate integrals (or sums) of products of functions under certain conditions. Hölder's work also includes contributions to the theory of groups and algebra.
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A mathematician who worked on Fourier series and group theory.[ref]
Ludwig Otto Hölder by John Joseph O'Connor and Edmund Frederick Robertson. MacTutor: quick information and early work
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Portrait of Otto Hölder
. Studio inscription: H. Brandseph, Stuttgart. Kunstbibliothek Berlin, accession 1992,32/003a.105; scan from Reinhard Bölling’s Das Fotoalbum für Weierstraß (1994); crop uploaded by Sebastian Wallroth. Commons claims origin/life-plus-100-or-shorter public domain, author death in 1907, and pre-1931 United States publication. Source usage terms, via Wikimedia Commons. Source..jpg){kind=link}