= Segfaults = sage: R = QQ['x,y'].fraction_field() sage: x,y = R.gens() sage: a = x sage: str(a)
sage: P = PolynomialRing(QQ, 2, 'x') sage: x = P.gens() sage: from sage.combinat.misc import umbral_operation sage: a = umbral_operation(x[0]^3)
sage: Partition([3,2,1]).arms_legs_coeff(1,1)