identity endomorphism造句

例句与造句

1. 20 ) " The endomorphism ring of an Abelian group is trivial if and only if the Abelian group in question is the trivial group . " Explanation / reference ? ( It's easy : there is always the identity endomorphism and the zero endomorphism .)
2. It's difficult to find identity endomorphism in a sentence. 用identity endomorphism造句挺难的