Famiglie di curve sulle superfici algebriche
Foliations in algebraic surfaces having a rational first integral.
Given a foliation F in an algebraic surface having a rational first integral a genus formula for the general solution is obtained. In the case S = P2 some new counter-examples to the classic formulation of the Poincaré problem are presented. If S is a rational surface and F has singularities of type (1, 1) or (1,-1) we prove that the general solution is a non-singular curve.
Free Resolutions of The Defining Ideal of Certain Rational Surfaces.
Frobenius pull-back of vector bundles of rank 2 over non-uniruled varieties.