Countable Discrete Space is Sigma-Compact/Proof 2
Theorem
Let $T = \struct {S, \tau}$ be a countable discrete topological space.
Then $T$ is $\sigma$-compact.
Proof
A direct application of Countable Space is Sigma-Compact.
Let $T = \struct {S, \tau}$ be a countable discrete topological space.
Then $T$ is $\sigma$-compact.
A direct application of Countable Space is Sigma-Compact.