The well-known fiber dimension theorem in algebraic geometry says that for every morphism f: X → Y of integral schemes of finite type,the dimension of each
It is known that every differentiable map from the circle to a rational variety S1 → X can be approximated by an algebraic map P1(R) → X.In particular,any
I learn from Dolgachev that there is an old question which is attributed to Gizatullin: Are there any automorphisms of quartic K3 surfaces arizing from the