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  3. let r and s be commutative rings with unity. (a) l

Let R and S be commutative rings with unity. (a) Let I be an ideal of...

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Advance Math

Let R and S be commutative rings with unity. (a) Let I be anideal of R and let J be an ideal of S. Prove that I × J = {(a, b) |a ? I, b ? J} is an ideal of R × S. (b) (Harder!) Let L be anyideal of R × S. Prove that there exists an ideal I of R and anideal J of S such that L = I × J.

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