Question 344086
"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."
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please see:
http://en.wikipedia.org/wiki/Defined_and_undefined
or
http://en.wikipedia.org/wiki/Well-definition
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