Reports de recerca: Enviaments recents

Ara es mostren els items 13-24 de 403

    • Paired and semipaired domination in near-triangulations 

      Hernando Martín, María del Carmen; Claverol Aguas, Mercè; Maureso Sánchez, Montserrat; Mora Giné, Mercè; Tejel Altarriba, Francisco Javier (2022-07-22)
      Report de recerca
      Accés obert
      A dominating set of a graph G is a subset D of vertices such that every vertex not in D is adjacent to at least one vertex in D. A dominating set D is paired if the subgraph induced by its vertices has a perfect matching, ...

    • Bohr-Sommerfeld quantization of b-symplectic toric manifolds 

      Miranda Galcerán, Eva; Mir Garcia, Pau; Weitsman, Jonathan (2022-03-07)
      Report de recerca
      Accés obert
      We define the Bohr-Sommerfeld quantization via T-modules for a b-symplectic toric manifold and show that it coincides with the formal geometric quantization of [GMW18b]. In particular, we prove that its dimension is given ...

    • Rank axioms and supersimplicity 

      Cárdenas Martín, Santiago; Farré Cirera, Rafael (2022-02-13)
      Report de recerca
      Accés obert
      Just as Lascar’s notion of abstract rank axiomatizes the U rank, we propose axioms for the ranks SUd and SUf , the foundation ranks of dividing and forking. We study the relationships between these axioms. As with superstable, ...

    • The [Theta]-operator and the low hierarchy 

      Castro Rabal, Jorge; Seara Ojea, Carlos (1992-07)
      Report de recerca
      Accés obert
      Long and Sheu in their paper [LS-91] introduced a refinement of the low hierarchy based on the [Theta]-levels of the polynomial time hierarchy which gives a deeper sight of the internal structure of NP. In this paper we ...

    • Singular cotangent models and complexity in fluids with dissipation 

      Coquinot, Baptiste; Mir Garcia, Pau; Miranda Galcerán, Eva (2022-06-17)
      Report de recerca
      Accés obert
      In this article we analyze several mathematical models with singularities where the classical cotangent model is replaced by a b-cotangent model. We provide physical interpretations of the singular symplectic geometry ...

    • Contiguous and internal graph searching 

      Barrière Figueroa, Eulalia; Fraigniaud, Pierre; Santoro, Nicola; Thilikos, Dimitrios M. (2002)
      Report de recerca
      Accés obert
      In the graph searching problem, we are given a graph whose edges are all "contaminated", and, via a sequence of "steps" using "searchers", we want to obtain a state of the graph in which all edges are simultaneously "clear". ...

    • Breakdown of homoclinic orbits to L3 in the RPC3BP (II). An asymptotic formula 

      Baldomá Barraca, Inmaculada; Giralt Miron, Mar; Guàrdia Munarriz, Marcel (2021-07-21)
      Report de recerca
      Accés obert
      The Restricted 3-Body Problem models the motion of a body of negligible mass under the gravitational influence of two massive bodies called the primaries. If one assumes that the primaries perform circular motions and that ...

    • On the singular Weinstein conjecture and the existence of escape orbits for b-Beltrami fields 

      Miranda Galcerán, Eva; Oms, Cédric; Peralta-Salas, Daniel (2021-10-07)
      Report de recerca
      Accés obert
      Motivated by Poincare’s orbits going to infinity in the (restricted) three-body problem ´ (see [29] and [7]), we investigate the generic existence of heteroclinic-like orbits in a neighbourhood of the critical set of a ...

    • Integrable systems on singular symplectic manifolds: from local to global 

      Miranda Galcerán, Eva; Cardona, Robert (2021-02-03)
      Report de recerca
      Accés obert
      In this article, we consider integrable systems on manifolds endowed with symplectic structures with singularities of order one. These structures are symplectic away from a hypersurface where the symplectic volume goes ...

    • Turing universality of the incompressible Euler equations and a conjecture of Moore 

      Miranda Galcerán, Eva; Cardona, Robert; Peralta-Salas, Daniel (2021-04-09)
      Report de recerca
      Accés obert
      In this article we construct a compact Riemannian manifold of high dimension on which the time dependent Euler equations are Turing complete. More precisely, the halting of any Turing machine with a given input is equivalent ...

    • Geometric quantization via cotangent models 

      Miranda Galcerán, Eva; Mir Garcia, Pau (2022-05-05)
      Report de recerca
      Accés obert
      In this article we give a universal model for geometric quantization associated to a real polarization given by an integrable system with non-degenerate singularities. This universal model goes one step further than the ...

    • Computability and Beltrami fields in Euclidean space 

      Miranda Galcerán, Eva; Peralta Salas, Daniel; Cardona, Robert (2022-11-15)
      Report de recerca
      Accés obert
      In this article, we pursue our investigation of the connections between the theory of computation and hydrodynamics. We prove the existence of stationary solutions of the Euler equations in Euclidean space, of Beltrami ...