RingElem IndetPower(const PolyRing& P, long var, long exp) // error if exp < 0
{
P->myCheckIndetIndex(var, "IndetPower(P, var, exp)");
if (exp < 0) CoCoA_ERROR(ERR::NegExp, "IndetPower(P, var, exp)");
RingElem ans(P, 1);
P->myIndetPower(raw(ans), var, exp);
return ans;
}
RingElem deriv(ConstRefRingElem f, long x) // here x is the index of the variable
{
const PolyRing Rx = owner(f);
Rx->myCheckIndetIndex(x, "deriv(f, x)");
return deriv(f, indet(Rx, x));
}