Regular boundary elements

Regular boundary elements
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by Robin Harte

Proc. Amer. Math. Soc. 99 (1987), 328-330

DOI: https://doi.org/10.1090/S0002-9939-1987-0870795-5

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In a Banach algebra the regular elements in the closure of the group of invertibles are in a generalized sense "of index zero".

References

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