public Polynomial sub(Polynomial poly) {
int deg = degree > poly.degree ? degree : poly.degree;
Number lcoeffs[] = new Number[deg + 1];
for (int i = 0; i <= deg; ++i) {
if (i <= degree && i <= poly.degree) lcoeffs[i] = baseRing.sub(coeffs[i], poly.coeffs[i]);
else if (i <= degree) lcoeffs[i] = coeffs[i];
else lcoeffs[i] = baseRing.getInverse(poly.coeffs[i]);
}
return valueOf(lcoeffs);
}
