Plan 9 - man page for nan (plan9 section 2)
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NaN, Inf, isNaN, isInf - not-a-number and infinity functions
int isInf(double, int)
The IEEE floating point standard defines values called `not-a-number' and positive and
negative `infinity'. These values can be produced by such things as overflow and division
by zero. Also, the library functions sometimes return them when the arguments are not in
the domain, or the result is out of range.
NaN returns a double that is not-a-number. IsNaN returns true if its argument is not-a-
Inf(i) returns positive infinity if i is greater than or equal to zero, else negative
infinity. IsInf returns true if its first argument is infinity with the same sign as the
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