例句與造句

1. Over a Dedekind domain that is not a PID, the ideal class group measures the difference between projective indecomposable modules and principal indecomposable modules : the projective indecomposable modules are exactly the ( modules isomorphic to ) nonzero ideals and the principal indecomposable modules are precisely the ( modules isomorphic to ) nonzero principal ideals.
2. Over a Dedekind domain that is not a PID, the ideal class group measures the difference between projective indecomposable modules and principal indecomposable modules : the projective indecomposable modules are exactly the ( modules isomorphic to ) nonzero ideals and the principal indecomposable modules are precisely the ( modules isomorphic to ) nonzero principal ideals.
3. It's difficult to find projective indecomposable module in a sentence. 用projective indecomposable module造句挺難的