Question: 18. A ring element a is called an idempotent if a2 = a. Prove that the only idempotents in an integral domain are 0 and

18. A ring element a is called an idempotent if a2

18. A ring element a is called an idempotent if a2 = a. Prove that the only idempotents in an integral domain are 0 and 1

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