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. = PolynomialRing(QQ,13,order='invlex') I = R.ideal([ mynumerator((uy1^2)-(ux1^3+3*ua*(ux1+1)^2)) , mynumerator((ux1)-(uX1/uZ1^2)) , mynumerator((uy1)-(uY1/uZ1^3)) , mynumerator((uZZ1)-(uZ1^2)) , mynumerator((uy2^2)-(ux2^3+3*ua*(ux2+1)^2)) , mynumerator((ux2)-(uX2/uZ2^2)) , mynumerator((uy2)-(uY2/uZ2^3)) , mynumerator((uZZ2)-(uZ2^2)) ]) J = I + R.ideal([0 , uX1-uX2 , uZZ1-uZZ2 , uY1-uY2 , uZ1-uZ2 ]) ua = fastfrac(ua) ux2 = fastfrac(ux2) uy2 = fastfrac(uy2) ux1 = fastfrac(ux1) uy1 = fastfrac(uy1) uX1 = fastfrac(uX1) uZZ1 = fastfrac(uZZ1) uY1 = fastfrac(uY1) uZ1 = fastfrac(uZ1) uX2 = fastfrac(uX2) uZZ2 = fastfrac(uZZ2) uY2 = fastfrac(uY2) uZ2 = fastfrac(uZ2) uA = ((uX2*uZ1^2-uX1*uZ2^2)) uB = ((uY2*uZ1^3-uY1*uZ2^3)) uX3 = ((uB^2-uA^3-uZ1^2*uZ2^2*fastfrac(3)*ua*uA^2-uZ2^2*fastfrac(2)*uA^2*uX1)) uY3 = ((uB*(uZ2^2*uA^2*uX1-uX3)-uZ2^3*uA^3*uY1)) uZ3 = ((uZ1*uZ2*uA)) uZZ3 = ((uZ3^2)) ux3 = (((-ux1^3+(ux2-fastfrac(3)*ua)*ux1^2+(ux2^2+fastfrac(6)*ua*ux2)*ux1+(uy1^2-fastfrac(2)*uy2*uy1+(-ux2^3-fastfrac(3)*ua*ux2^2+uy2^2)))/(ux1^2-fastfrac(2)*ux2*ux1+ux2^2))).reduce() uy3 = ((((-uy1+fastfrac(2)*uy2)*ux1^3+(-fastfrac(3)*ua*uy1+(-fastfrac(3)*uy2*ux2+fastfrac(3)*ua*uy2))*ux1^2+((fastfrac(3)*ux2^2+fastfrac(6)*ua*ux2)*uy1-fastfrac(6)*ua*uy2*ux2)*ux1+(uy1^3-fastfrac(3)*uy2*uy1^2+(-fastfrac(2)*ux2^3-fastfrac(3)*ua*ux2^2+fastfrac(3)*uy2^2)*uy1+(uy2*ux2^3+fastfrac(3)*ua*uy2*ux2^2-uy2^3)))/(-ux1^3+fastfrac(3)*ux2*ux1^2-fastfrac(3)*ux2^2*ux1+ux2^3))).reduce() print isidentity((uy3^2)-(ux3^3+fastfrac(3)*ua*(ux3+fastfrac(1))^2)) print isidentity((ux3)-(uX3/uZ3^2)) print isidentity((uy3)-(uY3/uZ3^3)) print isidentity((uZZ3)-(uZ3^2)) unified = True uZZ4 = uZZ3 uX4 = uX3 uY4 = uY3 uZ4 = uZ3 ux4 = ((fastfrac(9)/(fastfrac(4)*uy1^2)*ux1^4+fastfrac(9)/uy1^2*ua*ux1^3+(fastfrac(9)/uy1^2*ua^2+fastfrac(9)/uy1^2*ua)*ux1^2+(fastfrac(18)/uy1^2*ua^2-fastfrac(2))*ux1+(fastfrac(9)/uy1^2*ua^2-fastfrac(3)*ua))).reduce() uy4 = ((-fastfrac(27)/(fastfrac(8)*uy1^3)*ux1^6-fastfrac(81)/(fastfrac(4)*uy1^3)*ua*ux1^5+(-fastfrac(81)/(fastfrac(2)*uy1^3)*ua^2-fastfrac(81)/(fastfrac(4)*uy1^3)*ua)*ux1^4+(-fastfrac(27)/uy1^3*ua^3-fastfrac(81)/uy1^3*ua^2+fastfrac(9)/(fastfrac(2)*uy1))*ux1^3+(-fastfrac(81)/uy1^3*ua^3-fastfrac(81)/(fastfrac(2)*uy1^3)*ua^2+fastfrac(27)/(fastfrac(2)*uy1)*ua)*ux1^2+(-fastfrac(81)/uy1^3*ua^3+fastfrac(9)/uy1*ua^2+fastfrac(9)/uy1*ua)*ux1+(-fastfrac(27)/uy1^3*ua^3+fastfrac(9)/uy1*ua^2-uy1))).reduce() if unified: unified = isdoublingidentity((uy4^2)-(ux4^3+fastfrac(3)*ua*(ux4+fastfrac(1))^2)) if unified: unified = isdoublingidentity((ux4)-(uX4/uZ4^2)) if unified: unified = isdoublingidentity((uy4)-(uY4/uZ4^3)) if unified: unified = isdoublingidentity((uZZ4)-(uZ4^2)) if unified: print "Unified"