defswinnerton_dyer_poly(n, x=None, **args):"""Generates n-th Swinnerton-Dyer polynomial in `x`. """fromnumberfieldsimportminimal_polynomialifn <=0:raiseValueError("can't generate Swinnerton-Dyer polynomial of order %s"% n)ifxisnotNone: sympify(x)else: x = Dummy('x')ifn >3: p =2a...