Category:Metrizable Tangent Disc Topology
Jump to navigation
Jump to search
This category contains results about Metrizable Tangent Disc Topology.
Let $A$ be a countable subset of the $x$-axis in the Cartesian plane $\R^2$.
Let $P$ denote the open upper half-plane in $\R^2$.
Let $S := A \cup P$.
Let $\struct {S, \tau}$ be the topological subspace of the Niemytzki plane.
$\struct {S, \tau}$ is referred to as the metrizable tangent disc topology.
This category currently contains no pages or media.