A ring homomophism f from a ring R onto another ring S is an isomophism if and only if kerf=0.( )
A ring homomophism f from a ring R onto another ring S is an isomophism if and only if kerf=0.( )
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A ring homomophism f from a ring R onto another ring S is an isomophism if and only if kerf=0.( )