Category:Perfectly T4 Spaces
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This category contains results about perfectly $T_4$ spaces.
$T$ is a perfectly $T_4$ space if and only if:
- $(1): \quad T$ is a $T_4$ space
- $(2): \quad$ Every closed set in $T$ is a $G_\delta$ set.
That is:
- Every closed set in $T$ can be written as a countable intersection of open sets of $T$.
Subcategories
This category has the following 2 subcategories, out of 2 total.
Pages in category "Perfectly T4 Spaces"
The following 5 pages are in this category, out of 5 total.