On a Kreĭn Criterion

DOI10.1007/978-3-7643-8911-6_12zbMath1176.47006OpenAlexW168823218MaRDI QIDQ3613529

Adrian Sandovici

Publication date: 12 March 2009

Published in: Spectral Theory in Inner Product Spaces and Applications (Search for Journal in Brave)

Full work available at URL: https://doi.org/10.1007/978-3-7643-8911-6_12

zbMATH Keywords

Hilbert spacenonnegative linear relationnonnegative self-adjoint operator extension

Mathematics Subject Classification ID

Linear symmetric and selfadjoint operators (unbounded) (47B25) Dilations, extensions, compressions of linear operators (47A20) Linear relations (multivalued linear operators) (47A06)

Cites Work

• Form sums of nonnegative selfadjoint operators
• Positive selfadjoint extensions of positive symmetric subspaces
• Extremal extensions of sectorial linear relations
• Positive selfadjoint extensions of positive symmetric operators
• Characterizations of positive selfadjoint extensions
• On von Neumann’s problem in extension theory of nonnegative operators
• Extension theory of formally normal and symmetric subspaces
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