First Countable Space
# Definition
Suppose $(X, \tau)$ is a Topological Space. Then $X$ is a First Countable Space if for each $x \in X$, there exists a Countable Neighborhood Basis.
Search
Suppose $(X, \tau)$ is a Topological Space. Then $X$ is a First Countable Space if for each $x \in X$, there exists a Countable Neighborhood Basis.