ThmDex – An index of mathematical definitions, results, and conjectures.

ThmDex – An index of mathematical definitions, results, and conjectures.

Formulation F9137 on R4000: Empty set is clopen

F9137

Formulation 0

Let $T = (X, \mathcal{T})$ be a D1106: Topological space.

Then $\emptyset$ is a D2640: Clopen set in $T$.