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pro vyhledávání: '"Elijah Ray"'
Autor:
Elijah Ray, Alexander Y. Gordon
Publikováno v:
Applicable Analysis. 93:316-321
We consider a continuous family {As}s∈S of self-adjoint operators in a separable Hilbert space parametrized by a complete metric space S. It is well known that simple isolated eigenvalues behave “well” under small changes of the parameter – t