Abstract
We generalize the well-known Sinclair lemma for Hermitian elements, proving pointwise versions for generalized scalar operators and unbounded skew-Hermitian operators.
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Boyadzhiev, K.N. Sinclair type inequalities for the local spectral radius and related topics. Israel J. Math. 57, 272–284 (1987). https://doi.org/10.1007/BF02766214
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DOI: https://doi.org/10.1007/BF02766214