You can
put this solution on YOUR website! "In mathematics, defined and undefined are used to explain whether or not expressions have meaningful, sensible, and unambiguous values. Whether an expression has a meaningful value depends on the context of the expression. For example the value of 4 − 5 is undefined if a positive integer result is required."
please see:
http://en.wikipedia.org/wiki/Defined_and_undefined
or
http://en.wikipedia.org/wiki/Well-definition
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