def mynumerator(x):
  if parent(x) == R:
    return x
  return numerator(x)

class fastfrac:
  def __init__(self,top,bot=1):
    if parent(top) == ZZ or parent(top) == R:
      self.top = R(top)
      self.bot = R(bot)
    elif top.__class__ == fastfrac:
      self.top = top.top
      self.bot = top.bot * bot
    else:
      self.top = R(numerator(top))
      self.bot = R(denominator(top)) * bot
  def reduce(self):
    return fastfrac(self.top / self.bot)
  def sreduce(self):
    return fastfrac(I.reduce(self.top),I.reduce(self.bot))
  def iszero(self):
    return self.top in I and not (self.bot in I)
  def isdoublingzero(self):
    return self.top in J and not (self.bot in J)
  def __add__(self,other):
    if parent(other) == ZZ:
      return fastfrac(self.top + self.bot * other,self.bot)
    if other.__class__ == fastfrac:
      return fastfrac(self.top * other.bot + self.bot * other.top,self.bot * other.bot)
    return NotImplemented
  def __sub__(self,other):
    if parent(other) == ZZ:
      return fastfrac(self.top - self.bot * other,self.bot)
    if other.__class__ == fastfrac:
      return fastfrac(self.top * other.bot - self.bot * other.top,self.bot * other.bot)
    return NotImplemented
  def __neg__(self):
    return fastfrac(-self.top,self.bot)
  def __mul__(self,other):
    if parent(other) == ZZ:
      return fastfrac(self.top * other,self.bot)
    if other.__class__ == fastfrac:
      return fastfrac(self.top * other.top,self.bot * other.bot)
    return NotImplemented
  def __rmul__(self,other):
    return self.__mul__(other)
  def __div__(self,other):
    if parent(other) == ZZ:
      return fastfrac(self.top,self.bot * other)
    if other.__class__ == fastfrac:
      return fastfrac(self.top * other.bot,self.bot * other.top)
    return NotImplemented
  def __pow__(self,other):
    if parent(other) == ZZ:
      return fastfrac(self.top ^ other,self.bot ^ other)
    return NotImplemented

def isidentity(x):
  return x.iszero()

def isdoublingidentity(x):
  return x.isdoublingzero()

R.<ua2,ua6,ux1,uy1,uX1,uY1,uZ1> = PolynomialRing(GF(2),7,order='invlex')
I = R.ideal([
  mynumerator((uy1^2+ux1*uy1)-(ux1^3+ua2*ux1^2+ua6))
, mynumerator((ux1)-(uX1/uZ1))
, mynumerator((uy1)-(uY1/uZ1^2))
, mynumerator((ua2)-(0))
])

ua2 = fastfrac(ua2)
ua6 = fastfrac(ua6)
ux1 = fastfrac(ux1)
uy1 = fastfrac(uy1)
uX1 = fastfrac(uX1)
uY1 = fastfrac(uY1)
uZ1 = fastfrac(uZ1)


uA = ((uZ1^2))
uB = ((ua6*uA^2))
uC = ((uX1^2))
uZ3 = ((uA*uC))
uX3 = ((uC^2+uB))
uY3 = (((uY1^2+ua2*uZ3+uB)*uX3+uZ3*uB))

ux3 = (((ux1+uy1/ux1)^2+(ux1+uy1/ux1)+ua2)).reduce()
uy3 = (((ux1+uy1/ux1)^3+(ux1+ua2+fastfrac(1))*(ux1+uy1/ux1)+ua2+uy1)).reduce()

print isidentity((uy3^2+ux3*uy3)-(ux3^3+ua2*ux3^2+ua6))
print isidentity((ux3)-(uX3/uZ3))
print isidentity((uy3)-(uY3/uZ3^2))