例句與造句

1. For such spaces the Alexandroff extension is called the "'one-point compactification "'or "'Alexandroff compactification " '.
2. Under the natural partial ordering on the set \ mathcal { C } ( X ) of equivalence classes of compactifications, any minimal element is equivalent to the Alexandroff extension ( Engelking, Theorem 3.5 . 12 ).
3. Then the Alexandroff extension of " X " is a certain compact space " X " * together with an compactification if and only if " X " is a locally compact, noncompact Hausdorff space.
4. It's difficult to find alexandroff extension in a sentence. 用alexandroff extension造句挺難的