On the existence of finite surjective parametrizations of affine surfaces

Abstract

We investigate surjective parametrizations of rational algebraic varieties, in the vein of recent work by Jorge Caravantes, J. Rafael Sendra, David Sevilla, and Carlos Villarino. In particular, we show how to construct plenty of examples of affine surfaces S not admitting a finite surjective morphism f : A 2 → S.