Asked by Mary
Let R be a ring. The center of R is the set C= {x exists in R| ax=xa for all a in R}. Show that C is a subring of R.
Answers
Answered by
MathMate
See:
http://en.wikibooks.org/wiki/Ring_Theory/Subrings
http://en.wikibooks.org/wiki/Ring_Theory/Subrings
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