Abstract
The project consists of the study of two problems: the first one is to study the cohomology rings of 3-manifolds known as ``torus semi-bundles''. This problem is a continuation of the results obtained in the candidate's PhDthesis, where the cohomology ring of torus bundles was determined. The study of the cohomology of such spaces is of interestsince they admit one of Thurston's eight geo…