Systeme en X,Y,Z : 4*X+2*Y^2*Z+1,4*Y^4*Z^2+4*Y^2*Z+2-2*Y^4*Z-Y^2-4*Z, 4*Y^4*Z^3+4*Y^2*Z^2+Z+4*Y^2*Z+2-16*Y^2 Systeme en X,Y,Z,T : 6*X*Y^2*T-X^2*Z*T-6*X*Y*Z*T+3*X*Z^2*T-2*Z^3*T-6*X*Y^2+6*X*Y*Z-2*X*Z^2, -63*X*Y^2*T^2+9*X^2*Z*T^2+63*X*Y*Z*T^2+18*Y^2*Z*T^2-27*X*Z^2*T^2 -18*Y*Z^2*T^2+18*Z^3*T^2+78*X*Y^2*T-78*X*Y*Z*T-18*Y^2*Z*T +24*X*Z^2*T+18*Y*Z^2*T-9*Z^3*T-15*X*Y^2+15*X*Y*Z-5*X*Z^2, 18*X^2*Y^2*T-3*X^3*Z*T-18*X^2*Y*Z*T+12*X*Y^2*Z*T+5*X^2*Z^2*T-12*X*Y*Z^2*T +6*X*Z^3*T-8*Z^4*T-18*X^2*Y^2+18*X^2*Y*Z -12*X*Y^2*Z-4*X^2*Z^2+12*X*Y*Z^2-6*X*Z^3, -X^2*Y*T+3*X*Y^2*T+10*Y^3*T-15*Y^2*Z*T+3*Y*Z^2*T-3*X*Y^2-10*Y^3 +X*Y*Z+15*Y^2*Z-5*Y*Z^2 Systeme en X1,X2,X3,X4 a coefficients dans Q(K1,K2,T1,T2,T3,T4) : X1^4-2*K1*X1*X2*X4^2-3*K2*X3*X4^3-T1*X1^3, X1^2*X2+K1*X2*X4^2-T2*X1^2, X1^3*X3+K2*X3*X4^3-T3*X1^3, X1^3*X4+2*K1*X1*X2*X4^2+3*K2*X3*X4^3-T4*X1^3