例句與造句

1. He found necessary and sufficient conditions for metrizability and orderability of ultrametric spaces.
2. Complete metrizability is a topological property while completeness is a property of the metric.
3. :When we talk about metrizability, we need to know which topology is used.
4. As there exist metrizable spaces that are not completely metrizable, complete uniformizability is a strictly weaker condition than complete metrizability.
5. Second-countability is therefore a rather restrictive property on a topological space, requiring only a separation axiom to imply metrizability.
6. It's difficult to find metrizability in a sentence. 用metrizability造句挺難的
7. I did have something weaker in mind; basically I was just wondering whether there are " necessary and sufficient " conditions that imply pra-metrizability.
8. Unlike Urysohn's metrization theorem, which provides only a sufficient condition for metrizability, this theorem provides both a necessary and sufficient condition for a topological space to be metrizable.