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Irrational numbers.

In
mathematics, an **
irrational number** is any
real number that is not a
rational number, i.e., one that cannot be written as a
fraction *a* / *b* with *a* and *b*
integers and *b* not zero. This is also known as being *incommensurable*, or without common measure. The irrational numbers are precisely those numbers whose expansion in any given base (decimal, binary, etc.) never ends and never enters a periodic pattern. "Almost all" real numbers are irrational, in a sense which is defined more precisely below.

This category has the following 4 subcategories, out of 4 total.

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