x
x A(x, y, z)
z
x y
B(x, y)
x y
x ¬∃y∃zA(y, z,x)
x
∃y∃z (A(y,z, x)&¬∃u∃vA(u, v, y)&¬∃t∃sA(t, s, z)).
x y
∃t∃z(A(t, z, x)&¬∃u∃vA(u, v, t)&B(y, t)).
x
∃t∃z∃y(A(t, z, x)&¬∃u∃vA(u, v, t)&B(y, t)& (y)).
x
x y
1
∃u∃v(P (x, u, v)&∃z(P (v,z, y) ∨P (z, v, y)))
2
∃t∃z∃u∃v(P (t, z, u)&P (t, z, v)&¬E(u, v)&
&∃w∃s(P (u, w, x) ∨P (w, u, x)) & (P (v, s, y) ∨P (s, v, y))) & ¬M(x)
3
∃t∃z∃u∃v∃w∃s(P (t, z, x)&(P (t, z, u)&¬E(x, u)&(P (u, v, w) ∨
∨P (v, u, w)) & (P (w, s, y) ∨P (s, w, y))) & M(x)