## infinite set

<*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

Try this search on Wikipedia, OneLook, Google

**Nearby terms:**

**infinite set**» infinity » infix notation » infix syntax