Von Neumann's theorem

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In mathematics, von Neumann's theorem is a result in the operator theory of linear operators on Hilbert spaces.

Statement of the theorem[]

Let and be Hilbert spaces, and let be an unbounded operator from into Suppose that is a closed operator and that is densely defined, that is, is dense in Let denote the adjoint of Then is also densely defined, and it is self-adjoint. That is,

and the operators on the right- and left-hand sides have the same dense domain in [1]

References[]

  1. ^ Acuña, Pablo (2021). "von Neumann's Theorem Revisited". Foundations of Physics. 51 (3): 73. doi:10.1007/s10701-021-00474-5. ISSN 0015-9018.
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