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Erratum to: ''Essential spectrum for a Hilbert space operator"\ (Trans. Amer. Math. Soc. {\bf 163}\ (1972), 437–445)
1974
Transactions of the American Mathematical Society
We assume the notation and conventions of [2] . In its published form [2] contained the following theorem: Theorem 3. // T is a closed operator which is reduced by each finitedimensional subspace ker (T -z) for any complex z then (2), (3), (4), and (5), from the following sets are identical. Furthermore, if T is also reduced by each finite-dimensional subspace ker (T* -z) then all five sets are identical: the points of o(T) which are not isolated eigenvalues of finite algebraic multiplicity.
doi:10.1090/s0002-9947-1974-0350448-8
fatcat:jakfiblglzbqzixtvwjvstymum