On the cosine-sine operator functional equations

DOI10.1007/BF01819756zbMath0232.47044MaRDI QIDQ2550909

A. B. Buche

Publication date: 1971

Published in: Aequationes Mathematicae (Search for Journal in Brave)

Full work available at URL: https://eudml.org/doc/136193

Mathematics Subject Classification ID

Spectrum, resolvent (47A10) Groups and semigroups of linear operators (47D03) Operator sine and cosine functions and higher-order Cauchy problems (47D09)

Related Items (3)

On an exponential-cosine operator-valued functional equation ⋮ Unnamed Item ⋮ Trigonometric identities in *-algebras

Cites Work

• On the functional equation $f(x+y)f(x-y)=f^2(x)-f^2 (y)$
• On some functional equations in Banach spaces
• ON SOME FUNCTIONAL EQUATIONS ASSOCIATED WITH SEMIGROUPS OF OPERATORS
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