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Let A be a bounded operator on a separable, infinite dimensional Hilbert space H. Moreover, assume that A is not in the set C + K(H) of operators expressible as a sum of a scalar multiple of identity and a compact operator. What is the smallest similarity invariant semigroup containing operator A? Equivalently, which operators can be expressed as products… (More)

@inproceedings{Kavkler2006SimilarityIS,
title={Similarity Invariant Semigroups Generated by Non-fredholm Operators},
author={Iztok Kavkler},
year={2006}
}