sequentially compact space造句

例句与造句

1. Every sequentially compact space is countably compact, and every first-countable, countably compact space is sequentially compact.
2. It is almost trivial to prove that the product of two sequentially compact spaces is sequentially compact one passes to a subsequence for the first component and then a subsubsequence for the second component.
3. It's difficult to find sequentially compact space in a sentence. 用sequentially compact space造句挺难的