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Sull’approssimazione spettrale di operatori lineari in spazi di Banach. (Italian) Zbl 0457.47006

Pubbl., Ser. III, Ist. Appl. Calcolo 131, 40 p. (1978).

MSC:

47A10 Spectrum, resolvent
47B06 Riesz operators; eigenvalue distributions; approximation numbers, \(s\)-numbers, Kolmogorov numbers, entropy numbers, etc. of operators
47B44 Linear accretive operators, dissipative operators, etc.
46E35 Sobolev spaces and other spaces of “smooth” functions, embedding theorems, trace theorems
46E99 Linear function spaces and their duals