pow(
exp : NTP
) : NTP ;
-- This feature returns self to the power exp, providing that the result
-- is representable, otherwise it shall return nil!
exp2 : NTP ;
-- This feature returns the number which is 2 to the power of self,
-- providing that this is representable, otherwise nil is to be returned.
exp10 : NTP ;
-- This routine returns 10 to the power of self provided that this is
-- representable in the value domain, otherwise nil.
log2 : NTP ;
-- This feature returns the value of log(self) to the base 2, rounded if
-- necessary for whole number classes.