Second-Countable Space - Natural & Formal Sciences - Mathematics & Logic Dictionary Definition A topological space that possesses a countable base (a countable collection of open sets such that every open set is a union of members of that collection).
Second-Countable Space - Natural & Formal Sciences - Mathematics & Logic Dictionary Definition A topological space that possesses a countable base (a countable collection of open sets such that every open set is a union of members of that collection).