A characterization of semilocal inertial coefficient rings
Authors:
W. C. Brown and E. C. Ingraham
Journal:
Proc. Amer. Math. Soc. 26 (1970), 10-14
MSC:
Primary 13.95
DOI:
https://doi.org/10.1090/S0002-9939-1970-0260730-2
MathSciNet review:
0260730
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Abstract | References | Similar Articles | Additional Information
Abstract: A commutative ring $R$ with identity is called an inertial coefficient ring if every finitely generated $R$-algebra $A$ with $A/N$ separable over $R$ contains a separable subalgebra $S$ such that $S + N = A$, where $N$ is the Jacobson radical of $A$. Thus inertial coefficient rings are those commutative rings $R$ for which a generalization of the Wedderburn Principal Theorem holds for suitable $R$-algebras. Our purpose is to prove that a commutative ring with only finitely many maximal ideals is an inertial coefficient ring (if and) only if it is a finite direct sum of Hensel rings.
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- William C. Brown, Strong inertial coefficient rings, Michigan Math. J. 17 (1970), 73–84. MR 263802 N. Bourbaki, Algèbre commutative. Chapitres I, II, Actualités Sci. Indust., no. 1290, Hermann, Paris, 1961. MR 36 #146.
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Keywords:
Inertial coefficient ring,
Hensel ring,
inertial subalgebra,
separable algebra,
lifting idempotents
Article copyright:
© Copyright 1970
American Mathematical Society