We show that any tetragonal Gorenstein integral curve is a complete intersection in its respective 3-fold rational normal scroll S, implying that the normal sheaf on C embedded in S, and in P g-1 as well, is unstable for ...

In this paper we develop a general representation theory for MV-algebras. We furnish the appropriate categorical background to study this problem. Our guide line is the theory of classifying topoi of coherent extensions ...

In sheaf theory we have at our disposal the so called "germination process" by means of which a sheaf can be obtained, in a natural manner, from data provided by a presheaf. Essentially, "germination" is a stalk producing ...

Because it is necessary to study a good part of the theory of Algebraic Geometry before approaching enclosed dives between ringed spaces, we believe that giving an overview of the structure of work is equivalent to giving ...

© 2017 Elsevier B.V. Given a vector bundle E, on an irreducible projective variety X, we give a necessary and sufficient criterion for E to be a direct image of a line bundle under a surjective étale morphism. The criterion ...

We will study as central paper, the quasi-coherent sheaves on noetherian related schemes. On the other hand, it is known that the way introducing the study of cohomology is not generally only. In the present we will use ...

Este trabajo es tanto un estudio como una revisión de la teoría de haces en el momento de su emergencia: alrededor de los años 50s. El estudio-revisión propuesto no es un recuento cronológico de hechos y personajes, sino ...

We study the Picard-Fuchs equation from both the classical and modern perspectives. The classical perspective uses only elementary calculus on manifolds, while the modern perspective looks at the problem using the tools ...

It is well known that in quantum mechanics we cannot always define consistently properties that are context independent. Many approaches exist to describe contextual properties, such as Contextuality by Default (CbD), sheaf ...