“perfectly normal”的概念、定义、翻译、参考文献-科学参考

单词	perfectly normal
释义	perfectly normal Mathematics A topological space X in which, given any two disjoint, non-empty, closed subsets A and B, there exists a continuous function f:X→[0,1] such that A is the pre-image of 0 and B is the pre-image of 1. See separation axioms.
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