Let R be a ring with more than one element such that for each nonzero a

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Let R be a ring with more than one element such that for each nonzero a ϵ R there is a unique b ϵ R such that aba = a. Prove:

(a) R has no zero divisors.

(b) bab = b.

(c) R has an identity.

(d) R is a division ring.

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