Representation theorems for indefinite quadratic forms without spectral gap

DOI10.1007/s00020-015-2252-3zbMath1343.47002arXiv1409.2409OpenAlexW3103822234MaRDI QIDQ747182

Stephan Schmitz

Publication date: 23 October 2015

Published in: Integral Equations and Operator Theory (Search for Journal in Brave)

Full work available at URL: https://arxiv.org/abs/1409.2409

zbMATH Keywords

representation theoremindefinite quadratic formoff-diagonal perturbation

Mathematics Subject Classification ID

Perturbation theory of linear operators (47A55) Quadratic and bilinear forms, inner products (15A63) Representation theory of linear operators (47A67) Forms (bilinear, sesquilinear, multilinear) (47A07)

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Representation theorems for solvable sesquilinear forms ⋮ Maximal \(L^p\)-regularity and \(H^\infty\)-calculus for block operator matrices and applications ⋮ Diagonalization of indefinite saddle point forms ⋮ On invariant graph subspaces ⋮ A Kato's second type representation theorem for solvable sesquilinear forms ⋮ Representation of non-semibounded quadratic forms and orthogonal additivity ⋮ Self-adjoint indefinite Laplacians ⋮ On a minimax principle in spectral gaps

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