A dense countable subset of a second-countable topological space #
noncomputable def denseCountable (T : Type u_1) [TopologicalSpace T] [SecondCountableTopology T] :
Set T
A countable dense subset of a second-countable topological space.
Equations
- denseCountable T = ⋯.choose
Instances For
theorem dense_denseCountable {T : Type u_1} [TopologicalSpace T] [SecondCountableTopology T] :
Dense (denseCountable T)