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On properties of spectral approximations. (English) Zbl 0401.65032
Equadiff. IV, Proc., Prague 1977, Lect. Notes Math. 703, 81-85 (1979).
##### MSC:
 65J10 Numerical solutions to equations with linear operators 47A10 Spectrum, resolvent 47B06 Riesz operators; eigenvalue distributions; approximation numbers, $$s$$-numbers, Kolmogorov numbers, entropy numbers, etc. of operators