countable

A set $S$ is countable if there exists a bijection between $S$ and some subset of $\mathbb{N}$.

All finite sets are countable.

Title	countable
Canonical name	Countable
Date of creation	2013-03-22 11:59:00
Last modified on	2013-03-22 11:59:00
Owner	vampyr (22)
Last modified by	vampyr (22)
Numerical id	6
Author	vampyr (22)
Entry type	Definition
Classification	msc 03E10
Related topic	ProofThatTheRationalsAreCountable
Related topic	CantorSet
Related topic	AverageValueOfFunction
Related topic	NumerableSet
Related topic	SierpinskiSetOfEuclideanPlane