<*mathematics*> A set with an infinite number of elements.
There are several possible definitions, e.g.

(i) ("Dedekind infinite") A set X is infinite if there exists a bijection (one-to-one mapping) between X and some proper subset of X.

(ii) A set X is infinite if there exists an injection from N (the set of natural numbers) to X.

In the presence of the Axiom of Choice all such definitions are equivalent.

Last updated: 1995-03-27

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**Nearby terms:**
Infinite Impulse Response « infinite loop « Infinite Monkey Theorem « **infinite set** » infinity » infix notation » infix syntax

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Copyright Denis Howe 1985