Approximately invariant subspaces for unbounded linear operators. II

DOI10.1007/BF01350194zbMath0345.47023OpenAlexW2064836756MaRDI QIDQ1233195

Palle E. T. Jorgensen

Publication date: 1977

Published in: Mathematische Annalen (Search for Journal in Brave)

Full work available at URL: https://eudml.org/doc/162974

Mathematics Subject Classification ID

Linear symmetric and selfadjoint operators (unbounded) (47B25) Groups and semigroups of linear operators (47D03) Invariant subspaces of linear operators (47A15) Linear accretive operators, dissipative operators, etc. (47B44)

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• A<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>λ</mml:mi><mml:mrow><mml:msup><mml:mrow><mml:mi>ϕ</mml:mi></mml:mrow><mml:mrow><mml:mn>4</mml:mn></mml:mrow></mml:msup></mml:mrow></mml:math>Quantum Field Theory without Cutoffs. I