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Results tagged with overt-spaces
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user 5690
Overtness is the lattice dual of compactness in various forms of constructive topology and analysis, where related ideas are also called "located" (constructive analysis), "recursively enumerable" (computable analysis), "open" (locale theory) or "positive" (formal topology).
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Duality between compactness and Hausdorffness
Hmm...
I used to think of "compact" as dual to "discrete".
Here are two instances of compact/discrete dualities:
Pontryagin duality:
Given an abelian group $A$, its Pontryagin dual $A^*:=\mathrm{Hom …
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