  We consider surjective endomorphisms f of degree > 1 on the projective
n-space with n = 3, and f^{-1}-stable hypersurfaces V. We show that V is a
hyperplane (i.e., deg(V) = 1) but with four possible exceptions; it is
conjectured that deg(V) = 1 for any n > 1.

Algebraic Geometry;Dynamical Systems