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(Solved): 5. Let \( M \) be a proper ideal of the ring \( R \). Prove that \( M \) is a maximal ideal if and ...
5. Let \( M \) be a proper ideal of the ring \( R \). Prove that \( M \) is a maximal ideal if and only if, for each ideal \( I \) of \( R \), either \( I \subseteq M \) or else \( I+M=R \).