private void InvertF3()
{
IntegerPolynomial a = new IntegerPolynomial(new int[] { -1, 1, 1, 0, -1, 0, 1, 0, 0, 1, -1 });
IntegerPolynomial b = a.InvertF3();
AssertEqualsMod(new int[] { 1, 2, 0, 2, 2, 1, 0, 2, 1, 2, 0 }, b.Coeffs, 3);
VerifyInverse(a, b, 3);
// test a non-invertible polynomial
a = new IntegerPolynomial(new int[] { 0, 1, -1, 1, 0, 0, 0, 0, -1, 0, 0 });
b = a.InvertF3();
if (b != null)
throw new Exception("IntegerPolynomialTest InvertF3 test failed!");
}