一个环R∈（M）当且仅当R的每一个非零同态象或者包含一个非零M理想或者有本质理想。
A ring Re, (M) iff each nonzero homomorphic image of R either contains a nonzero M-ideal or has an essential ideal.
一个环R∈（M）当且仅当R的每一个非零同态象或者包含一个非零M理想或者有本质理想。
A ring Re, (M) iff each nonzero homomorphic image of R either contains a nonzero M-ideal or has an essential ideal.
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