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Allgemeine Eigenwerttheorie Hermitescher Funktionaloperatoren
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This article is published in Mathematische Annalen.The article was published on 1930-12-01. It has received 504 citations till now.read more
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Complex Symmetric Operators and Applications II
TL;DR: In this paper, it was shown that a bounded linear operator T on a complex Hilbert space H is complex symmetric if T = CT*C, where C is a conjugation (an isometric, antilinear involution of H).
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Eine Spektraltheorie für allgemeine Operatoren eines unitären Raumes. Erhard Schmidt zum 75. Geburtstag in Verehrung gewidmet
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Two-Sided Ideals and Congruences in the Ring of Bounded Operators in Hilbert Space
TL;DR: In this paper, it has been shown that the ring B of bounded everywhere defined operators in Hilbert space contains non-trivial two-sided ideals, which is the case of the ring of all linear operators over a unitary space with finite dimension number.
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Neue Begründung der Theorie quadratischer Formen von unendlichvielen Veränderlichen.
TL;DR: In this paper, the Theorie der Integralgleichungen and die anschließenden neueren Untersuchungen sind von vornherein von dem Bestreben getragen worden.