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This paper is a continuation of an earlier article entitled “Approximately reducing subspaces for unbounded linear operators”. But in the present context we replace the word “reducing” by “invariant”
This work is supported by Odense University, Denmark
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Jørgensen, P.E.T. Approximately invariant subspaces for unbounded linear operators. II. Math. Ann. 227, 177–182 (1977). https://doi.org/10.1007/BF01350194
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DOI: https://doi.org/10.1007/BF01350194