Some problems concerning the pseudoeffective cone of blown-up surfaces and projectivized vector bundles

We discuss a couple of problems concerning the pseudoeffective cone of a projective variety. In the first part we deal with the influence of a generalization of the Segre Conjecture on the Mori cone of a blown-up surface. In the second part we prove the existence of a weak Zariski decomposition for the pseudoeffective divisors of a number of projectivized vector bundle

Sur la définition des variables

Nous argumentons en faveur d’une définition strictement intrinsèque et syntaxique de la catégorie des variables dans le cadre de la théorie gouvernement-liage. L’analyse de structures de l’italien contenant des objets nuls, des PROarb et des pronoms résomptifs appuie l’idée que les notions de variable syntaxique et de variable sémantique ne sont pas coextensives. Des arguments qui ont trait à la typologie des catégories vides et aux propriétés de la théorie unifiée du liage, au sens de McA’Nulty (1983) et di Sciullo (1982), justifient indépendamment une définition intrinsèque de la catégorie des variables syntaxiques. Dans notre système, les variables sont les seules catégories vides marquées d’un Cas, ce qui les rend grammaticalement distinctes des autres catégories vides. En outre, des définitions contextuelles pour les catégories syntaxiques, et donc pour les variables syntaxiques, sont exclues par les principes de la théorie grammaticale que nous proposons.We argue in favor of a strictly syntactical and intrinsic definition for the category of variables in the Government Binding theory. The analysis of italian constructions involving null objects, PROarb and resumptive pronouns provides evidence that the notions syntactic variables and semantic variables are not coextensive. Arguments related to the typology of empty categories and to the properties of the unified binding theory, in the sense of McA'Nulty (1983) and di Sciullo (1982), justify independently an intrinsic definition of syntactic variables. In our system, variables are the only empty category with Case, this makes them grammatically distinct from the other empty categories. Furthermore, contextual definitions for syntactic categories, and thus for syntactic variables, are excluded by the principles of the theory of grammar that we propose

Asymmetry and the Language Faculty

In Syntactic Structures, Chomsky argues for the autonomy of syntax with respect to semantics on the one hand, and phonology on the other. In this paper, we argue that the autonomy of syntax is further supported by the derivation of sometime unpronounced functional categories. We propose an analysis of the pronunciation/silence of coordinate conjunction and prepositions in additive cardinal numerals and time counting expressions. We provide independent justifcations for our analysis as well as we identify extensions to recursive DP coordination and co-compounds. The analysis relies on structural asymmetries derived by the computational procedure of the Language Faculty and is enforced by principles of efcient computation. ---DOI: http://dx.doi.org/10.31513/linguistica.2017.v13n2a1403