isInfinite x
i1 : isInfinite 3. o1 = false
i2 : inf = 1/0. o2 = infinity o2 : RR (of precision 53)
i3 : isInfinite inf o3 = true
i4 : nan = inf - inf o4 = NotANumber o4 : RR (of precision 53)
i5 : isInfinite nan o5 = false
The object isInfinite is a method function.