Remark on the essential spectrum of symmetrizable operators

DOI10.3792/pja/1195526318zbMath0259.47001OpenAlexW2077885195MaRDI QIDQ5674532

Y. Itagaki

Publication date: 1971

Published in: Proceedings of the Japan Academy, Series A, Mathematical Sciences (Search for Journal in Brave)

Full work available at URL: https://doi.org/10.3792/pja/1195526318

Mathematics Subject Classification ID

Spectrum, resolvent (47A10) Linear symmetric and selfadjoint operators (unbounded) (47B25) (Semi-) Fredholm operators; index theories (47A53)

Cites Work

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• Theorems on ascent, descent, nullity and defect of linear operators
• On the essential spectrum of symmetrizable operators
• The basic propositions on defect numbers, root numbers and indices of linear operators
• Symmetrizable linear transformations

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