Pseudo-metric space
From HandWiki
A set $X$ endowed with a pseudo-metric. Each pseudo-metric space is normal (cf. Normal space) and satisfies the first axiom of countability. The second axiom of countability is satisfied if and only if $X$ is separable.
References
- [1] E. Čech, "Topological spaces", Interscience (1966) pp. 532
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