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Countability (Mathematics) (view source)

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Georg Cantor developed the concept of countability in the late 19th century.

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[[Image:Rationals countable.jpg|right|250px|thumb|While some details remain, such as eliminating reducible fractions, this picture shows the idea behind a numbering of all fractions.]]

In mathematics, a set is called '''countable''' if it can be numbered in such a way that every element will eventually receive a unique number.

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[[Georg Cantor]] developed the concept of countability -- and lack of countability -- in the late 19th century.

==Examples of Countable Sets==

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