An exactness lemma offers a simplified account of the spectral properties of the "holomorphic" analogue of normal solvability.
@article{bwmeta1.element.bwnjournal-article-smv117i2p107bwm,
author = {Robin Harte},
title = {On Kato non-singularity},
journal = {Studia Mathematica},
volume = {119},
year = {1996},
pages = {107-114},
zbl = {0838.47005},
language = {en},
url = {http://dml.mathdoc.fr/item/bwmeta1.element.bwnjournal-article-smv117i2p107bwm}
}
Harte, Robin. On Kato non-singularity. Studia Mathematica, Tome 119 (1996) pp. 107-114. http://gdmltest.u-ga.fr/item/bwmeta1.element.bwnjournal-article-smv117i2p107bwm/
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