def autom(self):
    '''Given a fct/form/cocycle self (Witt or usual), return phi(self), where phi(x) = x+1. Destined
    for curves y^2 = f(x^p - x).'''
    C = self.curve
    F = C.base_ring
    Rxy.<x, y> = PolynomialRing(F, 2)
    Fxy = FractionField(Rxy)
    if isinstance(self, superelliptic_function):
        result = superelliptic_function(C, Fxy(self.function).subs({x:x+1, y:y}))
        return result
    if isinstance(self, superelliptic_form):
        result = superelliptic_form(C, Fxy(self.form).subs({x:x+1, y:y}))
        return result
    if isinstance(self, superelliptic_witt):
        result = superelliptic_witt(autom(self.t), autom(self.f))
        return result
    if isinstance(self, superelliptic_drw_form):
        result = superelliptic_drw_form(0*C.x, autom(self.omega), autom(self.h2))
        result += autom(self.h1).teichmuller()*(C.x + C.one).teichmuller().diffn()
        return result
    if isinstance(self, superelliptic_drw_cech):
        result = superelliptic_drw_cech(autom(self.omega0), autom(self.f))
        return result