Planar Quadratic Vector Fields with
Finite Saddle Connection on a Straight Line (Convex Case)
Paulo Cesar Carriao
Maria Elasir Seabra Gomes
Antonio Augusto Gaspar Ruas

We classify the phase portraits of planar quadratic vector fields with a invariant straight line passing through two finite saddles, when the singularities of the field form a convex quadrilateral.