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Derivations on Commutative Banach Algebras
1982
Proceedings of the American Mathematical Society
Preserved Fulltext
Let A be a commutative Banach algebra with radical R and D be a derivation on A. If K = [x e R: for every « > 1, Z)"* e R}, then /)/! Ç R if and only if A" is closed.
doi:10.2307/2043809
fatcat:o6ws7jwfffbvdpx4ant5ske3l4