The Defined and undefined reference article from the English Wikipedia on 24-Apr-2004 (provided by Fixed Reference: snapshots of Wikipedia from wikipedia.org)

Defined and undefined

In mathematics, defined and undefined are used to explain things make sense or not in mathematical sense. These are also known as "well-behaved" or "ill-behaved."

For example, division by zero is called undefined (ill-behaved) since the result is infinite.

See also: mathematical singularity

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