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
Portrait of Otto Hölder
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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.