JORDAN PROPERTIES OF AUTOMORPHISM GROUPS OF CERTAIN OPEN ALGEBRAIC VARIETIES

摘要

Let W be a quasiprojective variety over an algebraically closed fi eld of characteristic zero. Assume that W is birational to a product of a smooth projective variety A and the projective line. We prove that if A contains no rational curves then the automorphism group G := Aut( W) of W is Jordan. That means that there is a positive integer J = J (W) such that every fi nite subgroup B of G contains a commutative subgroup A such that A is normal in B and the index [B : A] <= J.