scientific article; zbMATH DE number 3638580

zbMath0411.47006MaRDI QIDQ4199272

Saichi Izumino

Publication date: 1979

Title: zbMATH Open Web Interface contents unavailable due to conflicting licenses.

zbMATH Keywords

approximation by operatorsdistance between two operators

Mathematics Subject Classification ID

Norms (inequalities, more than one norm, etc.) of linear operators (47A30) Riesz operators; eigenvalue distributions; approximation numbers, (s)-numbers, Kolmogorov numbers, entropy numbers, etc. of operators (47B06) Spectrum, resolvent (47A10) (Semi-) Fredholm operators; index theories (47A53)

Related Items (3)

Closure of Invertible Operators on a Hilbert Space ⋮ Distance to Invertible Linear Operators without Separability ⋮ The instability of non-semi-Fredholm operators under compact perturbations

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