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Dictionary

count'ably ad'ditive func'tion

Math.
a set function that upon operating on the union of a countable number of disjoint sets gives the same result as the sum of the functional values of each set. Cf. finitely additive function.

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

countable

countably compact set

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