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isANumber -- whether a number is a number

Synopsis

Description

i1 : isANumber 3.

o1 = true
i2 : inf = 1/0.

o2 = infinity

o2 : RR (of precision 53)
i3 : isANumber inf

o3 = true
i4 : nan = inf - inf

o4 = NotANumber

o4 : RR (of precision 53)
i5 : isANumber nan

o5 = false