We can wonder if taking the isogonal conjugate of P here is natural, or, given P, which Q satisfy the same property that the isogonal conjugate P* in your statement.
[i.e. Let ABC be a triangle, P = (u:v:w) a fixed point, Q = (x:y:z) a variable point, A'B'C' the pedal triangle of P, La,Lb,Lc the parallels to PQ through A',B',C', resp. and L1,L2,L3 the reflections of La,Lb,Lc in the cevians AQ, BQ, CQ, resp. Which is the locus of Q such that L1,L2,L3 are concurrent?]
Will get a locus containing the isogonal conjugate of P:
The locus is a sextic throught P, P*, H, and the orthic triangle's vertices Ha,Hb,Hc.
For P = (u:v:w) the equation of the sextic is:
-a^4 b^2 c^4 u v x^4 y^2 + 2 a^2 b^4 c^4 u v x^4 y^2 -
b^6 c^4 u v x^4 y^2 + b^2 c^8 u v x^4 y^2 - a^6 c^4 v^2 x^4 y^2 +
2 a^4 b^2 c^4 v^2 x^4 y^2 - a^2 b^4 c^4 v^2 x^4 y^2 +
2 a^4 c^6 v^2 x^4 y^2 - 2 a^2 b^2 c^6 v^2 x^4 y^2 -
a^2 c^8 v^2 x^4 y^2 + a^4 b^2 c^4 u w x^4 y^2 -
b^6 c^4 u w x^4 y^2 - 2 a^2 b^2 c^6 u w x^4 y^2 +
b^2 c^8 u w x^4 y^2 + 2 a^4 b^2 c^4 v w x^4 y^2 -
2 a^2 b^4 c^4 v w x^4 y^2 - 2 a^2 b^2 c^6 v w x^4 y^2 +
a^4 b^2 c^4 u^2 x^3 y^3 - 2 a^2 b^4 c^4 u^2 x^3 y^3 +
b^6 c^4 u^2 x^3 y^3 - b^2 c^8 u^2 x^3 y^3 + a^6 c^4 u v x^3 y^3 -
3 a^4 b^2 c^4 u v x^3 y^3 + 3 a^2 b^4 c^4 u v x^3 y^3 -
b^6 c^4 u v x^3 y^3 - 2 a^4 c^6 u v x^3 y^3 + 2 b^4 c^6 u v x^3 y^3 +
a^2 c^8 u v x^3 y^3 - b^2 c^8 u v x^3 y^3 - a^6 c^4 v^2 x^3 y^3 +
2 a^4 b^2 c^4 v^2 x^3 y^3 - a^2 b^4 c^4 v^2 x^3 y^3 +
a^2 c^8 v^2 x^3 y^3 + 3 a^4 b^2 c^4 u w x^3 y^3 -
2 a^2 b^4 c^4 u w x^3 y^3 - b^6 c^4 u w x^3 y^3 -
2 a^2 b^2 c^6 u w x^3 y^3 + 2 b^4 c^6 u w x^3 y^3 -
b^2 c^8 u w x^3 y^3 + a^6 c^4 v w x^3 y^3 +
2 a^4 b^2 c^4 v w x^3 y^3 - 3 a^2 b^4 c^4 v w x^3 y^3 -
2 a^4 c^6 v w x^3 y^3 + 2 a^2 b^2 c^6 v w x^3 y^3 +
a^2 c^8 v w x^3 y^3 + a^4 b^2 c^4 u^2 x^2 y^4 -
2 a^2 b^4 c^4 u^2 x^2 y^4 + b^6 c^4 u^2 x^2 y^4 +
2 a^2 b^2 c^6 u^2 x^2 y^4 - 2 b^4 c^6 u^2 x^2 y^4 +
b^2 c^8 u^2 x^2 y^4 + a^6 c^4 u v x^2 y^4 -
2 a^4 b^2 c^4 u v x^2 y^4 + a^2 b^4 c^4 u v x^2 y^4 -
a^2 c^8 u v x^2 y^4 + 2 a^4 b^2 c^4 u w x^2 y^4 -
2 a^2 b^4 c^4 u w x^2 y^4 + 2 a^2 b^2 c^6 u w x^2 y^4 +
a^6 c^4 v w x^2 y^4 - a^2 b^4 c^4 v w x^2 y^4 +
2 a^2 b^2 c^6 v w x^2 y^4 - a^2 c^8 v w x^2 y^4 +
a^6 b^2 c^2 u v x^4 y z - 3 a^4 b^4 c^2 u v x^4 y z +
3 a^2 b^6 c^2 u v x^4 y z - b^8 c^2 u v x^4 y z -
a^4 b^2 c^4 u v x^4 y z + 2 a^2 b^4 c^4 u v x^4 y z -
b^6 c^4 u v x^4 y z - a^2 b^2 c^6 u v x^4 y z + b^4 c^6 u v x^4 y z +
b^2 c^8 u v x^4 y z + 2 a^4 b^2 c^4 v^2 x^4 y z -
2 a^2 b^4 c^4 v^2 x^4 y z - 2 a^2 b^2 c^6 v^2 x^4 y z -
a^6 b^2 c^2 u w x^4 y z + a^4 b^4 c^2 u w x^4 y z +
a^2 b^6 c^2 u w x^4 y z - b^8 c^2 u w x^4 y z +
3 a^4 b^2 c^4 u w x^4 y z - 2 a^2 b^4 c^4 u w x^4 y z -
b^6 c^4 u w x^4 y z - 3 a^2 b^2 c^6 u w x^4 y z +
b^4 c^6 u w x^4 y z + b^2 c^8 u w x^4 y z -
2 a^4 b^4 c^2 w^2 x^4 y z + 2 a^2 b^6 c^2 w^2 x^4 y z +
2 a^2 b^4 c^4 w^2 x^4 y z - a^6 b^2 c^2 u^2 x^3 y^2 z +
3 a^4 b^4 c^2 u^2 x^3 y^2 z - 3 a^2 b^6 c^2 u^2 x^3 y^2 z +
b^8 c^2 u^2 x^3 y^2 z - 2 a^2 b^4 c^4 u^2 x^3 y^2 z +
2 b^6 c^4 u^2 x^3 y^2 z + 3 a^2 b^2 c^6 u^2 x^3 y^2 z -
b^4 c^6 u^2 x^3 y^2 z - 2 b^2 c^8 u^2 x^3 y^2 z +
a^6 b^2 c^2 u v x^3 y^2 z - 3 a^4 b^4 c^2 u v x^3 y^2 z +
3 a^2 b^6 c^2 u v x^3 y^2 z - b^8 c^2 u v x^3 y^2 z -
6 a^4 b^2 c^4 u v x^3 y^2 z + 4 a^2 b^4 c^4 u v x^3 y^2 z +
2 b^6 c^4 u v x^3 y^2 z + 5 a^2 b^2 c^6 u v x^3 y^2 z -
b^4 c^6 u v x^3 y^2 z - a^8 c^2 v^2 x^3 y^2 z +
3 a^6 b^2 c^2 v^2 x^3 y^2 z - 3 a^4 b^4 c^2 v^2 x^3 y^2 z +
a^2 b^6 c^2 v^2 x^3 y^2 z + a^6 c^4 v^2 x^3 y^2 z -
2 a^4 b^2 c^4 v^2 x^3 y^2 z + a^2 b^4 c^4 v^2 x^3 y^2 z +
a^4 c^6 v^2 x^3 y^2 z - a^2 b^2 c^6 v^2 x^3 y^2 z -
a^2 c^8 v^2 x^3 y^2 z - 3 a^6 b^2 c^2 u w x^3 y^2 z +
5 a^4 b^4 c^2 u w x^3 y^2 z - a^2 b^6 c^2 u w x^3 y^2 z -
b^8 c^2 u w x^3 y^2 z + 6 a^4 b^2 c^4 u w x^3 y^2 z -
8 a^2 b^4 c^4 u w x^3 y^2 z + 2 b^6 c^4 u w x^3 y^2 z -
3 a^2 b^2 c^6 u w x^3 y^2 z - b^4 c^6 u w x^3 y^2 z +
2 a^6 b^2 c^2 v w x^3 y^2 z - 4 a^4 b^4 c^2 v w x^3 y^2 z +
2 a^2 b^6 c^2 v w x^3 y^2 z - 2 a^2 b^2 c^6 v w x^3 y^2 z -
2 a^6 b^2 c^2 w^2 x^3 y^2 z - 2 a^4 b^4 c^2 w^2 x^3 y^2 z +
4 a^2 b^6 c^2 w^2 x^3 y^2 z + 4 a^4 b^2 c^4 w^2 x^3 y^2 z -
2 a^2 b^4 c^4 w^2 x^3 y^2 z - 2 a^2 b^2 c^6 w^2 x^3 y^2 z -
a^6 b^2 c^2 u^2 x^2 y^3 z + 3 a^4 b^4 c^2 u^2 x^2 y^3 z -
3 a^2 b^6 c^2 u^2 x^2 y^3 z + b^8 c^2 u^2 x^2 y^3 z -
a^4 b^2 c^4 u^2 x^2 y^3 z + 2 a^2 b^4 c^4 u^2 x^2 y^3 z -
b^6 c^4 u^2 x^2 y^3 z + a^2 b^2 c^6 u^2 x^2 y^3 z -
b^4 c^6 u^2 x^2 y^3 z + b^2 c^8 u^2 x^2 y^3 z +
a^8 c^2 u v x^2 y^3 z - 3 a^6 b^2 c^2 u v x^2 y^3 z +
3 a^4 b^4 c^2 u v x^2 y^3 z - a^2 b^6 c^2 u v x^2 y^3 z -
2 a^6 c^4 u v x^2 y^3 z - 4 a^4 b^2 c^4 u v x^2 y^3 z +
6 a^2 b^4 c^4 u v x^2 y^3 z + a^4 c^6 u v x^2 y^3 z -
5 a^2 b^2 c^6 u v x^2 y^3 z - a^8 c^2 v^2 x^2 y^3 z +
3 a^6 b^2 c^2 v^2 x^2 y^3 z - 3 a^4 b^4 c^2 v^2 x^2 y^3 z +
a^2 b^6 c^2 v^2 x^2 y^3 z - 2 a^6 c^4 v^2 x^2 y^3 z +
2 a^4 b^2 c^4 v^2 x^2 y^3 z + a^4 c^6 v^2 x^2 y^3 z -
3 a^2 b^2 c^6 v^2 x^2 y^3 z + 2 a^2 c^8 v^2 x^2 y^3 z -
2 a^6 b^2 c^2 u w x^2 y^3 z + 4 a^4 b^4 c^2 u w x^2 y^3 z -
2 a^2 b^6 c^2 u w x^2 y^3 z + 2 a^2 b^2 c^6 u w x^2 y^3 z +
a^8 c^2 v w x^2 y^3 z + a^6 b^2 c^2 v w x^2 y^3 z -
5 a^4 b^4 c^2 v w x^2 y^3 z + 3 a^2 b^6 c^2 v w x^2 y^3 z -
2 a^6 c^4 v w x^2 y^3 z + 8 a^4 b^2 c^4 v w x^2 y^3 z -
6 a^2 b^4 c^4 v w x^2 y^3 z + a^4 c^6 v w x^2 y^3 z +
3 a^2 b^2 c^6 v w x^2 y^3 z - 4 a^6 b^2 c^2 w^2 x^2 y^3 z +
2 a^4 b^4 c^2 w^2 x^2 y^3 z + 2 a^2 b^6 c^2 w^2 x^2 y^3 z +
2 a^4 b^2 c^4 w^2 x^2 y^3 z - 4 a^2 b^4 c^4 w^2 x^2 y^3 z +
2 a^2 b^2 c^6 w^2 x^2 y^3 z + 2 a^4 b^2 c^4 u^2 x y^4 z -
2 a^2 b^4 c^4 u^2 x y^4 z + 2 a^2 b^2 c^6 u^2 x y^4 z +
a^8 c^2 u v x y^4 z - 3 a^6 b^2 c^2 u v x y^4 z +
3 a^4 b^4 c^2 u v x y^4 z - a^2 b^6 c^2 u v x y^4 z +
a^6 c^4 u v x y^4 z - 2 a^4 b^2 c^4 u v x y^4 z +
a^2 b^4 c^4 u v x y^4 z - a^4 c^6 u v x y^4 z +
a^2 b^2 c^6 u v x y^4 z - a^2 c^8 u v x y^4 z + a^8 c^2 v w x y^4 z -
a^6 b^2 c^2 v w x y^4 z - a^4 b^4 c^2 v w x y^4 z +
a^2 b^6 c^2 v w x y^4 z + a^6 c^4 v w x y^4 z +
2 a^4 b^2 c^4 v w x y^4 z - 3 a^2 b^4 c^4 v w x y^4 z -
a^4 c^6 v w x y^4 z + 3 a^2 b^2 c^6 v w x y^4 z -
a^2 c^8 v w x y^4 z - 2 a^6 b^2 c^2 w^2 x y^4 z +
2 a^4 b^4 c^2 w^2 x y^4 z - 2 a^4 b^2 c^4 w^2 x y^4 z -
a^4 b^4 c^2 u v x^4 z^2 + 2 a^2 b^6 c^2 u v x^4 z^2 -
b^8 c^2 u v x^4 z^2 + b^4 c^6 u v x^4 z^2 + a^4 b^4 c^2 u w x^4 z^2 -
b^8 c^2 u w x^4 z^2 - 2 a^2 b^4 c^4 u w x^4 z^2 +
b^4 c^6 u w x^4 z^2 - 2 a^4 b^4 c^2 v w x^4 z^2 +
2 a^2 b^6 c^2 v w x^4 z^2 + 2 a^2 b^4 c^4 v w x^4 z^2 +
a^6 b^4 w^2 x^4 z^2 - 2 a^4 b^6 w^2 x^4 z^2 + a^2 b^8 w^2 x^4 z^2 -
2 a^4 b^4 c^2 w^2 x^4 z^2 + 2 a^2 b^6 c^2 w^2 x^4 z^2 +
a^2 b^4 c^4 w^2 x^4 z^2 + a^6 b^2 c^2 u^2 x^3 y z^2 -
3 a^2 b^6 c^2 u^2 x^3 y z^2 + 2 b^8 c^2 u^2 x^3 y z^2 -
3 a^4 b^2 c^4 u^2 x^3 y z^2 + 2 a^2 b^4 c^4 u^2 x^3 y z^2 +
b^6 c^4 u^2 x^3 y z^2 + 3 a^2 b^2 c^6 u^2 x^3 y z^2 -
2 b^4 c^6 u^2 x^3 y z^2 - b^2 c^8 u^2 x^3 y z^2 +
3 a^6 b^2 c^2 u v x^3 y z^2 - 6 a^4 b^4 c^2 u v x^3 y z^2 +
3 a^2 b^6 c^2 u v x^3 y z^2 - 5 a^4 b^2 c^4 u v x^3 y z^2 +
8 a^2 b^4 c^4 u v x^3 y z^2 + b^6 c^4 u v x^3 y z^2 +
a^2 b^2 c^6 u v x^3 y z^2 - 2 b^4 c^6 u v x^3 y z^2 +
b^2 c^8 u v x^3 y z^2 + 2 a^6 b^2 c^2 v^2 x^3 y z^2 -
4 a^4 b^4 c^2 v^2 x^3 y z^2 + 2 a^2 b^6 c^2 v^2 x^3 y z^2 +
2 a^4 b^2 c^4 v^2 x^3 y z^2 + 2 a^2 b^4 c^4 v^2 x^3 y z^2 -
4 a^2 b^2 c^6 v^2 x^3 y z^2 - a^6 b^2 c^2 u w x^3 y z^2 +
6 a^4 b^4 c^2 u w x^3 y z^2 - 5 a^2 b^6 c^2 u w x^3 y z^2 +
3 a^4 b^2 c^4 u w x^3 y z^2 - 4 a^2 b^4 c^4 u w x^3 y z^2 +
b^6 c^4 u w x^3 y z^2 - 3 a^2 b^2 c^6 u w x^3 y z^2 -
2 b^4 c^6 u w x^3 y z^2 + b^2 c^8 u w x^3 y z^2 -
2 a^6 b^2 c^2 v w x^3 y z^2 + 2 a^2 b^6 c^2 v w x^3 y z^2 +
4 a^4 b^2 c^4 v w x^3 y z^2 - 2 a^2 b^2 c^6 v w x^3 y z^2 +
a^8 b^2 w^2 x^3 y z^2 - a^6 b^4 w^2 x^3 y z^2 -
a^4 b^6 w^2 x^3 y z^2 + a^2 b^8 w^2 x^3 y z^2 -
3 a^6 b^2 c^2 w^2 x^3 y z^2 + 2 a^4 b^4 c^2 w^2 x^3 y z^2 +
a^2 b^6 c^2 w^2 x^3 y z^2 + 3 a^4 b^2 c^4 w^2 x^3 y z^2 -
a^2 b^4 c^4 w^2 x^3 y z^2 - a^2 b^2 c^6 w^2 x^3 y z^2 +
a^4 b^4 c^2 u^2 x^2 y^2 z^2 - 2 a^2 b^6 c^2 u^2 x^2 y^2 z^2 +
b^8 c^2 u^2 x^2 y^2 z^2 - a^4 b^2 c^4 u^2 x^2 y^2 z^2 -
3 b^6 c^4 u^2 x^2 y^2 z^2 + 2 a^2 b^2 c^6 u^2 x^2 y^2 z^2 +
3 b^4 c^6 u^2 x^2 y^2 z^2 - b^2 c^8 u^2 x^2 y^2 z^2 -
a^8 c^2 v^2 x^2 y^2 z^2 + 2 a^6 b^2 c^2 v^2 x^2 y^2 z^2 -
a^4 b^4 c^2 v^2 x^2 y^2 z^2 + 3 a^6 c^4 v^2 x^2 y^2 z^2 +
a^2 b^4 c^4 v^2 x^2 y^2 z^2 - 3 a^4 c^6 v^2 x^2 y^2 z^2 -
2 a^2 b^2 c^6 v^2 x^2 y^2 z^2 + a^2 c^8 v^2 x^2 y^2 z^2 +
a^8 b^2 w^2 x^2 y^2 z^2 - 3 a^6 b^4 w^2 x^2 y^2 z^2 +
3 a^4 b^6 w^2 x^2 y^2 z^2 - a^2 b^8 w^2 x^2 y^2 z^2 -
2 a^6 b^2 c^2 w^2 x^2 y^2 z^2 + 2 a^2 b^6 c^2 w^2 x^2 y^2 z^2 +
a^4 b^2 c^4 w^2 x^2 y^2 z^2 - a^2 b^4 c^4 w^2 x^2 y^2 z^2 -
2 a^6 b^2 c^2 u^2 x y^3 z^2 + 4 a^4 b^4 c^2 u^2 x y^3 z^2 -
2 a^2 b^6 c^2 u^2 x y^3 z^2 - 2 a^4 b^2 c^4 u^2 x y^3 z^2 -
2 a^2 b^4 c^4 u^2 x y^3 z^2 + 4 a^2 b^2 c^6 u^2 x y^3 z^2 -
3 a^6 b^2 c^2 u v x y^3 z^2 + 6 a^4 b^4 c^2 u v x y^3 z^2 -
3 a^2 b^6 c^2 u v x y^3 z^2 - a^6 c^4 u v x y^3 z^2 -
8 a^4 b^2 c^4 u v x y^3 z^2 + 5 a^2 b^4 c^4 u v x y^3 z^2 +
2 a^4 c^6 u v x y^3 z^2 - a^2 b^2 c^6 u v x y^3 z^2 -
a^2 c^8 u v x y^3 z^2 - 2 a^8 c^2 v^2 x y^3 z^2 +
3 a^6 b^2 c^2 v^2 x y^3 z^2 - a^2 b^6 c^2 v^2 x y^3 z^2 -
a^6 c^4 v^2 x y^3 z^2 - 2 a^4 b^2 c^4 v^2 x y^3 z^2 +
3 a^2 b^4 c^4 v^2 x y^3 z^2 + 2 a^4 c^6 v^2 x y^3 z^2 -
3 a^2 b^2 c^6 v^2 x y^3 z^2 + a^2 c^8 v^2 x y^3 z^2 -
2 a^6 b^2 c^2 u w x y^3 z^2 + 2 a^2 b^6 c^2 u w x y^3 z^2 -
4 a^2 b^4 c^4 u w x y^3 z^2 + 2 a^2 b^2 c^6 u w x y^3 z^2 +
5 a^6 b^2 c^2 v w x y^3 z^2 - 6 a^4 b^4 c^2 v w x y^3 z^2 +
a^2 b^6 c^2 v w x y^3 z^2 - a^6 c^4 v w x y^3 z^2 +
4 a^4 b^2 c^4 v w x y^3 z^2 - 3 a^2 b^4 c^4 v w x y^3 z^2 +
2 a^4 c^6 v w x y^3 z^2 + 3 a^2 b^2 c^6 v w x y^3 z^2 -
a^2 c^8 v w x y^3 z^2 - a^8 b^2 w^2 x y^3 z^2 +
a^6 b^4 w^2 x y^3 z^2 + a^4 b^6 w^2 x y^3 z^2 -
a^2 b^8 w^2 x y^3 z^2 - a^6 b^2 c^2 w^2 x y^3 z^2 -
2 a^4 b^4 c^2 w^2 x y^3 z^2 + 3 a^2 b^6 c^2 w^2 x y^3 z^2 +
a^4 b^2 c^4 w^2 x y^3 z^2 - 3 a^2 b^4 c^4 w^2 x y^3 z^2 +
a^2 b^2 c^6 w^2 x y^3 z^2 + a^8 c^2 u v y^4 z^2 -
2 a^6 b^2 c^2 u v y^4 z^2 + a^4 b^4 c^2 u v y^4 z^2 -
a^4 c^6 u v y^4 z^2 - 2 a^6 b^2 c^2 u w y^4 z^2 +
2 a^4 b^4 c^2 u w y^4 z^2 - 2 a^4 b^2 c^4 u w y^4 z^2 +
a^8 c^2 v w y^4 z^2 - a^4 b^4 c^2 v w y^4 z^2 +
2 a^4 b^2 c^4 v w y^4 z^2 - a^4 c^6 v w y^4 z^2 -
a^8 b^2 w^2 y^4 z^2 + 2 a^6 b^4 w^2 y^4 z^2 - a^4 b^6 w^2 y^4 z^2 -
2 a^6 b^2 c^2 w^2 y^4 z^2 + 2 a^4 b^4 c^2 w^2 y^4 z^2 -
a^4 b^2 c^4 w^2 y^4 z^2 - a^4 b^4 c^2 u^2 x^3 z^3 +
b^8 c^2 u^2 x^3 z^3 + 2 a^2 b^4 c^4 u^2 x^3 z^3 -
b^4 c^6 u^2 x^3 z^3 - 3 a^4 b^4 c^2 u v x^3 z^3 +
2 a^2 b^6 c^2 u v x^3 z^3 + b^8 c^2 u v x^3 z^3 +
2 a^2 b^4 c^4 u v x^3 z^3 - 2 b^6 c^4 u v x^3 z^3 +
b^4 c^6 u v x^3 z^3 - a^6 b^4 u w x^3 z^3 + 2 a^4 b^6 u w x^3 z^3 -
a^2 b^8 u w x^3 z^3 + 3 a^4 b^4 c^2 u w x^3 z^3 +
b^8 c^2 u w x^3 z^3 - 3 a^2 b^4 c^4 u w x^3 z^3 -
2 b^6 c^4 u w x^3 z^3 + b^4 c^6 u w x^3 z^3 - a^6 b^4 v w x^3 z^3 +
2 a^4 b^6 v w x^3 z^3 - a^2 b^8 v w x^3 z^3 -
2 a^4 b^4 c^2 v w x^3 z^3 - 2 a^2 b^6 c^2 v w x^3 z^3 +
3 a^2 b^4 c^4 v w x^3 z^3 + a^6 b^4 w^2 x^3 z^3 -
a^2 b^8 w^2 x^3 z^3 - 2 a^4 b^4 c^2 w^2 x^3 z^3 +
a^2 b^4 c^4 w^2 x^3 z^3 + a^6 b^2 c^2 u^2 x^2 y z^3 +
a^4 b^4 c^2 u^2 x^2 y z^3 - a^2 b^6 c^2 u^2 x^2 y z^3 -
b^8 c^2 u^2 x^2 y z^3 - 3 a^4 b^2 c^4 u^2 x^2 y z^3 -
2 a^2 b^4 c^4 u^2 x^2 y z^3 + b^6 c^4 u^2 x^2 y z^3 +
3 a^2 b^2 c^6 u^2 x^2 y z^3 + b^4 c^6 u^2 x^2 y z^3 -
b^2 c^8 u^2 x^2 y z^3 + 2 a^6 b^2 c^2 u v x^2 y z^3 -
2 a^2 b^6 c^2 u v x^2 y z^3 - 4 a^4 b^2 c^4 u v x^2 y z^3 +
2 a^2 b^2 c^6 u v x^2 y z^3 + 4 a^6 b^2 c^2 v^2 x^2 y z^3 -
2 a^4 b^4 c^2 v^2 x^2 y z^3 - 2 a^2 b^6 c^2 v^2 x^2 y z^3 -
2 a^4 b^2 c^4 v^2 x^2 y z^3 + 4 a^2 b^4 c^4 v^2 x^2 y z^3 -
2 a^2 b^2 c^6 v^2 x^2 y z^3 - a^8 b^2 u w x^2 y z^3 +
2 a^6 b^4 u w x^2 y z^3 - a^4 b^6 u w x^2 y z^3 +
3 a^6 b^2 c^2 u w x^2 y z^3 + 4 a^4 b^4 c^2 u w x^2 y z^3 +
5 a^2 b^6 c^2 u w x^2 y z^3 - 3 a^4 b^2 c^4 u w x^2 y z^3 -
6 a^2 b^4 c^4 u w x^2 y z^3 + a^2 b^2 c^6 u w x^2 y z^3 -
a^8 b^2 v w x^2 y z^3 + 2 a^6 b^4 v w x^2 y z^3 -
a^4 b^6 v w x^2 y z^3 - a^6 b^2 c^2 v w x^2 y z^3 -
8 a^4 b^4 c^2 v w x^2 y z^3 - 3 a^2 b^6 c^2 v w x^2 y z^3 +
5 a^4 b^2 c^4 v w x^2 y z^3 + 6 a^2 b^4 c^4 v w x^2 y z^3 -
3 a^2 b^2 c^6 v w x^2 y z^3 + a^8 b^2 w^2 x^2 y z^3 +
2 a^6 b^4 w^2 x^2 y z^3 - a^4 b^6 w^2 x^2 y z^3 -
2 a^2 b^8 w^2 x^2 y z^3 - 3 a^6 b^2 c^2 w^2 x^2 y z^3 -
2 a^4 b^4 c^2 w^2 x^2 y z^3 + 3 a^2 b^6 c^2 w^2 x^2 y z^3 +
3 a^4 b^2 c^4 w^2 x^2 y z^3 - a^2 b^2 c^6 w^2 x^2 y z^3 +
2 a^6 b^2 c^2 u^2 x y^2 z^3 + 2 a^4 b^4 c^2 u^2 x y^2 z^3 -
4 a^2 b^6 c^2 u^2 x y^2 z^3 - 4 a^4 b^2 c^4 u^2 x y^2 z^3 +
2 a^2 b^4 c^4 u^2 x y^2 z^3 + 2 a^2 b^2 c^6 u^2 x y^2 z^3 +
2 a^6 b^2 c^2 u v x y^2 z^3 - 2 a^2 b^6 c^2 u v x y^2 z^3 +
4 a^2 b^4 c^4 u v x y^2 z^3 - 2 a^2 b^2 c^6 u v x y^2 z^3 +
a^8 c^2 v^2 x y^2 z^3 + a^6 b^2 c^2 v^2 x y^2 z^3 -
a^4 b^4 c^2 v^2 x y^2 z^3 - a^2 b^6 c^2 v^2 x y^2 z^3 -
a^6 c^4 v^2 x y^2 z^3 + 2 a^4 b^2 c^4 v^2 x y^2 z^3 +
3 a^2 b^4 c^4 v^2 x y^2 z^3 - a^4 c^6 v^2 x y^2 z^3 -
3 a^2 b^2 c^6 v^2 x y^2 z^3 + a^2 c^8 v^2 x y^2 z^3 +
a^6 b^4 u w x y^2 z^3 - 2 a^4 b^6 u w x y^2 z^3 +
a^2 b^8 u w x y^2 z^3 + 3 a^6 b^2 c^2 u w x y^2 z^3 +
8 a^4 b^4 c^2 u w x y^2 z^3 + a^2 b^6 c^2 u w x y^2 z^3 -
6 a^4 b^2 c^4 u w x y^2 z^3 - 5 a^2 b^4 c^4 u w x y^2 z^3 +
3 a^2 b^2 c^6 u w x y^2 z^3 + a^6 b^4 v w x y^2 z^3 -
2 a^4 b^6 v w x y^2 z^3 + a^2 b^8 v w x y^2 z^3 -
5 a^6 b^2 c^2 v w x y^2 z^3 - 4 a^4 b^4 c^2 v w x y^2 z^3 -
3 a^2 b^6 c^2 v w x y^2 z^3 + 6 a^4 b^2 c^4 v w x y^2 z^3 +
3 a^2 b^4 c^4 v w x y^2 z^3 - a^2 b^2 c^6 v w x y^2 z^3 +
2 a^8 b^2 w^2 x y^2 z^3 + a^6 b^4 w^2 x y^2 z^3 -
2 a^4 b^6 w^2 x y^2 z^3 - a^2 b^8 w^2 x y^2 z^3 -
3 a^6 b^2 c^2 w^2 x y^2 z^3 + 2 a^4 b^4 c^2 w^2 x y^2 z^3 +
3 a^2 b^6 c^2 w^2 x y^2 z^3 - 3 a^2 b^4 c^4 w^2 x y^2 z^3 +
a^2 b^2 c^6 w^2 x y^2 z^3 - a^8 c^2 u v y^3 z^3 -
2 a^6 b^2 c^2 u v y^3 z^3 + 3 a^4 b^4 c^2 u v y^3 z^3 +
2 a^6 c^4 u v y^3 z^3 - 2 a^4 b^2 c^4 u v y^3 z^3 -
a^4 c^6 u v y^3 z^3 - a^8 c^2 v^2 y^3 z^3 +
a^4 b^4 c^2 v^2 y^3 z^3 - 2 a^4 b^2 c^4 v^2 y^3 z^3 +
a^4 c^6 v^2 y^3 z^3 + a^8 b^2 u w y^3 z^3 - 2 a^6 b^4 u w y^3 z^3 +
a^4 b^6 u w y^3 z^3 + 2 a^6 b^2 c^2 u w y^3 z^3 +
2 a^4 b^4 c^2 u w y^3 z^3 - 3 a^4 b^2 c^4 u w y^3 z^3 +
a^8 b^2 v w y^3 z^3 - 2 a^6 b^4 v w y^3 z^3 + a^4 b^6 v w y^3 z^3 -
a^8 c^2 v w y^3 z^3 - 3 a^4 b^4 c^2 v w y^3 z^3 +
2 a^6 c^4 v w y^3 z^3 + 3 a^4 b^2 c^4 v w y^3 z^3 -
a^4 c^6 v w y^3 z^3 + a^8 b^2 w^2 y^3 z^3 - a^4 b^6 w^2 y^3 z^3 +
2 a^4 b^4 c^2 w^2 y^3 z^3 - a^4 b^2 c^4 w^2 y^3 z^3 -
a^4 b^4 c^2 u^2 x^2 z^4 - 2 a^2 b^6 c^2 u^2 x^2 z^4 -
b^8 c^2 u^2 x^2 z^4 + 2 a^2 b^4 c^4 u^2 x^2 z^4 +
2 b^6 c^4 u^2 x^2 z^4 - b^4 c^6 u^2 x^2 z^4 -
2 a^4 b^4 c^2 u v x^2 z^4 - 2 a^2 b^6 c^2 u v x^2 z^4 +
2 a^2 b^4 c^4 u v x^2 z^4 - a^6 b^4 u w x^2 z^4 +
a^2 b^8 u w x^2 z^4 + 2 a^4 b^4 c^2 u w x^2 z^4 -
a^2 b^4 c^4 u w x^2 z^4 - a^6 b^4 v w x^2 z^4 +
a^2 b^8 v w x^2 z^4 - 2 a^2 b^6 c^2 v w x^2 z^4 +
a^2 b^4 c^4 v w x^2 z^4 - 2 a^4 b^4 c^2 u^2 x y z^4 -
2 a^2 b^6 c^2 u^2 x y z^4 + 2 a^2 b^4 c^4 u^2 x y z^4 +
2 a^6 b^2 c^2 v^2 x y z^4 + 2 a^4 b^4 c^2 v^2 x y z^4 -
2 a^4 b^2 c^4 v^2 x y z^4 - a^8 b^2 u w x y z^4 -
a^6 b^4 u w x y z^4 + a^4 b^6 u w x y z^4 + a^2 b^8 u w x y z^4 +
3 a^6 b^2 c^2 u w x y z^4 + 2 a^4 b^4 c^2 u w x y z^4 -
a^2 b^6 c^2 u w x y z^4 - 3 a^4 b^2 c^4 u w x y z^4 -
a^2 b^4 c^4 u w x y z^4 + a^2 b^2 c^6 u w x y z^4 -
a^8 b^2 v w x y z^4 - a^6 b^4 v w x y z^4 + a^4 b^6 v w x y z^4 +
a^2 b^8 v w x y z^4 + a^6 b^2 c^2 v w x y z^4 -
2 a^4 b^4 c^2 v w x y z^4 - 3 a^2 b^6 c^2 v w x y z^4 +
a^4 b^2 c^4 v w x y z^4 + 3 a^2 b^4 c^4 v w x y z^4 -
a^2 b^2 c^6 v w x y z^4 + 2 a^6 b^2 c^2 u v y^2 z^4 +
2 a^4 b^4 c^2 u v y^2 z^4 - 2 a^4 b^2 c^4 u v y^2 z^4 +
a^8 c^2 v^2 y^2 z^4 + 2 a^6 b^2 c^2 v^2 y^2 z^4 +
a^4 b^4 c^2 v^2 y^2 z^4 - 2 a^6 c^4 v^2 y^2 z^4 -
2 a^4 b^2 c^4 v^2 y^2 z^4 + a^4 c^6 v^2 y^2 z^4 -
a^8 b^2 u w y^2 z^4 + a^4 b^6 u w y^2 z^4 +
2 a^6 b^2 c^2 u w y^2 z^4 - a^4 b^2 c^4 u w y^2 z^4 -
a^8 b^2 v w y^2 z^4 + a^4 b^6 v w y^2 z^4 -
2 a^4 b^4 c^2 v w y^2 z^4 + a^4 b^2 c^4 v w y^2 z^4
The figure is the case for P = G.
Francisco Javier García Capitán
21 November 2011
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