@Test
 public void testJacobiLegendre() {
   for (int i = 0; i < 10; ++i) {
     PolynomialFunction legendre = PolynomialsUtils.createLegendrePolynomial(i);
     PolynomialFunction jacobi = PolynomialsUtils.createJacobiPolynomial(i, 0, 0);
     checkNullPolynomial(legendre.subtract(jacobi));
   }
 }