Difference between revisions of "Irrational number"
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Revision as of 19:10, 25 November 2007
An irrational number is a real number that cannot be expressed as the ratio of two integers. Equivalently, an irrational number, when expressed in decimal notation, never terminates nor repeats. Examples are 
etc.
Because the rational numbers are countable while the reals are uncountable, one can say that the irrational numbers make up "almost all" of the real numbers.
See Also
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