Abstract
The present note is devoted to a geometric characteristic, the so called essential minimum modulus. We point out here some analogies with the previous results which became evident after the appearance of R. Bouldin’s paper [2].
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References
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Zemánek, J. (1982). Geometric Interpretation of the Essential Minimum Modulus. In: Apostol, C., Douglas, R.G., Sz.-Nagy, B., Voiculescu, D., Arsene, G. (eds) Invariant Subspaces and Other Topics. Operator Theory: Advances and Applications, vol 6. Birkhäuser, Basel. https://doi.org/10.1007/978-3-0348-5445-0_18
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DOI: https://doi.org/10.1007/978-3-0348-5445-0_18
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