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Hilbert space ℌ, let ${{\hat {A}}_{F}}$ and ${{\hat {A}}_{K}}$ be its Friedrichs and Krein extensions

="mathjax-tex">${{\hat {A}}_{K}}$ be its Friedrichs and Krein extensions, and let ?_∞ be the ideal

The Krein-Smulian theorem that a closed generating cone in a Banach space is nonflattened and a

The Krein-Smulian theorem that a closed generating cone in a Banach space is nonflattened and a

extension. More precisely, we show that the Friedrichs extension is a Sobolev problem with boundary

with degeneracy containing several different difference operators and constructed the Friedrichs extension

assumptions on the potential, the Friedrichs extension of such a restriction has continuous (sometimes

, the Friedrichs extension of such a restriction has continuous (sometimes absolutely continuous) spectrum filling

three-dimensional Krein space there exists unique two-valued probability measure.

On the hamiltonian–krein index for a non-self-adjoint spectral problem

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