Unbounded operator (English Wikipedia)

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von Neumann 1930, pp. 49–131 von Neumann, J. (1930), "Allgemeine Eigenwerttheorie Hermitescher Functionaloperatoren (General Eigenvalue Theory of Hermitian Functional Operators)", Mathematische Annalen, 102 (1), doi:10.1007/BF01782338, S2CID 121249803
von Neumann 1932, pp. 294–310 von Neumann, J. (1932), "Über Adjungierte Funktionaloperatore (On Adjoint Functional Operators)", Annals of Mathematics, Second Series, 33 (2), doi:10.2307/1968331, JSTOR 1968331

von Neumann 1932, pp. 294–310 von Neumann, J. (1932), "Über Adjungierte Funktionaloperatore (On Adjoint Functional Operators)", Annals of Mathematics, Second Series, 33 (2), doi:10.2307/1968331, JSTOR 1968331

von Neumann 1930, pp. 49–131 von Neumann, J. (1930), "Allgemeine Eigenwerttheorie Hermitescher Functionaloperatoren (General Eigenvalue Theory of Hermitian Functional Operators)", Mathematische Annalen, 102 (1), doi:10.1007/BF01782338, S2CID 121249803