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math.FA2011★ 2 cited
Natural Isomorphism from a Linear Map's Image to Complement of Nullspace
H. N. Friedel
There is a natural isomorphism from image to complement of nullspace, for a bounded linear map from a real Banach space onto a closed subspace of a real Hilbert space. This general…
math.FA2011
Self-Adjoint Extension of Symmetric Maps
H. N. Friedel
A densely-defined symmetric linear map from/to a real Hilbert space extends to a self-adjoint map. Extension is expressed via Riesz representation. For a case including Friedrichs…