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ax'iom of countabil'ity



Math.
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).

Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.

axiom of choiceaxion

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