Let R be acommutative ring and let b be a fixed element of R. Prove that the set b = {r is in R and r = cb for some element c in R} is an ideal of R.

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- Nov 7th 2008, 08:59 AMwvlilgurlmodern alg
Let R be acommutative ring and let b be a fixed element of R. Prove that the set b = {r is in R and r = cb for some element c in R} is an ideal of R.

- Nov 7th 2008, 10:45 AMThePerfectHacker