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Rigid Rings

Published online by Cambridge University Press:  20 January 2009

C. J. Maxson
Texas A & M University, College Station, Texas 77843
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If R is a ring with identity and E is the semigroup of identity preserving ring endomorphisms of R then the fixed ring of E is denned by for each φɛE}. R is said to be rigid if RE = R.Equivalently, R is rigid if and only if

Research Article
Copyright © Edinburgh Mathematical Society 1978



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