Separation axioms

The separation axioms¹ are a series of optional properties for topological spaces, ordered by strength.

$T 1$ ::: Fréchet space
$T 2$ ::: Hausdorff space
$T 4$ ::: Normal space (and Hausdorff)

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German Trennungsaxiome, whence their symbols $T 𝑛$ . ↩