Search Results

You are looking at 1 - 4 of 4 items for :

  • "Hilbert space operators" x
  • Mathematics and Statistics x
  • All content x
Clear All

. S. , Hilbert Space Operators , Birkhäuser (Boston, 2003). MR 2004f :47001 Kubrusly C. S. Hilbert Space Operators

Restricted access


T T is selfadjoint if T is a densely defined closed Hilbert space operator. This result of von Neumann can be generalized for not necessarily closed operators: TT always admits a positive selfadjoint extension. The Friedrichs extension also will be obtained whenever TT is assumed to be densely defined. Selfadjointness of TT will be investigated. Densely defined positive operators and their Friedrichs extension A and AF, respectively, will be described by showing the existence of a closable operator T such that A=TT and at the same time AF=TT∗∗.

Restricted access

space operators , Quaestiones Math. , 41 ( 2018 ), 585 - 600 . [12] Patrício , P. , The Moore-Penrose inverse of a companion

Restricted access