A high fibered power of a family of varieties of general type dominates a variety of general type

We prove the following theorem: Fibered Power Theorem: Let X\rar B be a smooth family of positive dimensional varieties of general type, with $B$ irreducible. Then there exists an integer $n>0$, a positive dimensional variety of general type $W_n$, and a dominant rational map X^n_B \das W_n.Comment: Latex2e (in latex 2.09 compatibility mode). To get a fun-free version change the `FUN' variable to `n' on the second line (option dedicated to my friend Yuri Tschinkel). Postscript file with color illustration available on http://math.bu.edu/INDIVIDUAL/abrmovic/fibered.p

Darboux theory of integrability for a class of nonautonomous vector fields

The goal of this paper is to extend the classical Darboux theory of integrability from autonomous polynomial vector fields to a class of nonautonomous vector fields. We also provide sufficient conditions for applying this theory of integrability and we illustrate this theory in several examples.Postprint (published version

Automorphisms and non-integrability

On this note we prove that a holomorphic foliation of the projective plane with rich, but finite, automorphism group does not have invariant algebraic curves.<br>Seja {mathcal F} uma folheação do plano projetivo complexo de grau d com grupo de automorfismo finito e cuja ação no espaço de cofatores não possui ponto fixo. Neste artigo mostramos que se {mathcal F} possui ao menos uma singularidade genérica então {mathcal F} não possui nenhuma curva algébrica invariante