noun, Mathematics.
See under .
noun, Mathematics.
the property satisfied by a topological space in which the neighborhood system of each point has a base consisting of a countable number of neighborhoods (first axiom of countability) or the property satisfied by a topological space that has a base for its topology consisting of a countable number of subsets of the space (second axiom of countability)


Read Also:

  • First-base

    noun 1. Baseball. Idioms 2. get to first base, Informal. noun 1. (baseball) 2. (informal, mainly US & Canadian) get to first base, to accomplish the first step of an undertaking noun phrase In early sexual play, holding hands: ”In sixth grade,” she said, ”first base is holding hands, and second base is kissing on […]

  • First-baseman

    noun, Baseball. 1. the player whose position is first base.

  • First blood

    noun 1. the first killing or wounding in a fight or war 2. the first damage or reverse inflicted on an opponent in a conflict

  • First blush

    noun first glance or sight, initial occurrence Usage Note used in “at first blush” see: at first blush

Disclaimer: First-axiom-of-countability definition / meaning should not be considered complete, up to date, and is not intended to be used in place of a visit, consultation, or advice of a legal, medical, or any other professional. All content on this website is for informational purposes only.