pow - raise a number to a power
x y pow -> number
pow computes x raised to the y-th power (x^y).
Raises a RangeCheck error if x is negative, unless y is positive
integer.
Plesser
17.05.2004
/home/abuild/rpmbuild/BUILD/nest-2.20.git-build/nest-2.20.git/sli/slimath.cc