countable

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Related to countably: Countably additive, Countably compact

countable

[′kau̇nt·ə·bəl]
(mathematics)
Either finite or denumerable. Also known as enumerable.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.

countable

(mathematics)
A term describing a set which is isomorphic to a subet of the natural numbers. A countable set has "countably many" elements. If the isomorphism is stated explicitly then the set is called "a counted set" or "an enumeration".

Examples of countable sets are any finite set, the natural numbers, integers, and rational numbers. The real numbers and complex numbers are not
This article is provided by FOLDOC - Free Online Dictionary of Computing (foldoc.org)
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Thus, [iota] will be injective on [mathematical expression not reproducible] for all but countably many of the partitions P compatible with [[omega].sub.0].
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Using this and the definition of countably additive, we see that [zeta] [member of] [[SIGMA].sub.m] [PHI]([A.sub.m]) iff for all [epsilon] > 0, there exists some N [member of] N and points [MATHEMATICAL EXPRESSION NOT REPRODUCIBLE IN ASCII] with [m.sub.i] < N so that [absolute value of [[SIGMA].sub.i][y.sub.i] - [zeta]] < [epsilon].
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184), while, in every formal system, only countably many are available.
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One example of an L-space

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