first-countable space
Sign in to saveAlso known as first axiom of countability
topological space in which every point admits a countable neighborhood basis
Connections
second-countable space
Entity
order topology
Entity
mathematics
Entity
International Standard Book Number
Entity
topology
Entity
sequence
Entity
subset
Entity
continuous function
Entity
metric space
Entity
topological space
Entity
number line
Entity
ball
Entity
limit of a sequence
Entity
limit of a function
Entity
countable set
Entity
open set
Entity
neighborhood
Entity
algebraic variety
Entity
limit point
Entity
uncountable set
Entity