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Ara es mostren els items 37-48 de 48

    • Slope inequalities for fibrations of non-maximal Albanese dimension 

      Barja Yáñez, Miguel Ángel (2021-06-15)
      Article
      Accés obert
      We study and obtain Slope inequalities for fibred irregular varieties of non-maximal Albanese dimension. We give a comparison theorem between Clifford–Severi and Slope inequalities for this type of fibrations. We also ...

    • Slope inequalities for higher dimensional irregular fibrations 

      Barja Yáñez, Miguel Ángel (2022-07-28)
      Article
      Accés restringit per política de l'editorial
      We prove the equivalence between Clifford-Severi inequalities for good classes of varieties of maximal Albanese dimension and Slope Inequalities for such varieties fibred over curves. This provides a big set of new Slope ...

    • Stability and singularities of relative hypersurfaces 

      Barja Yáñez, Miguel Ángel; Stoppino, Lidia (2014-07-30)
      Report de recerca
      Accés obert
      We study relative hypersurfaces, and prove an instability condition for the fibres. This is the starting point for an investigation of the geometry of effective divisors on relative projective bundles.

    • Surfaces on the Severi line 

      Barja Yáñez, Miguel Ángel; Pardini, Rita; Stoppino, Lidia (2016-05-01)
      Article
      Accés obert
      Let S be a minimal complex surface of general type and of maximal Albanese dimension; by the Severi inequality one has K-S(2) >= 4 chi(O-S). We prove that the equality K-S(2) = 4 chi(O-S) holds if and only if q(S) := ...

    • The eventual paracanonical map of a variety of maximal Albanese dimension 

      Barja Yáñez, Miguel Ángel; Pardini, Rita; Stoppino, Lidia (2019)
      Article
      Accés obert
      Let Xbe a smooth complex projective variety such that the Albanese map of Xis generically ¿nite onto its image. Here we study the so-called eventual m-paracanonical map of X, whose existence is implied by the results of ...

    • The representation problem of pairs of symmetric second order tensors in the context of solid mechanics 

      Barja Yáñez, Miguel Ángel; Carol, Ignacio; Planas Vilanova, Francesc d'Assís; Rizzi, Egidio (2003)
      Report de recerca
      Accés restringit per decisió de l'autor

    • The structure and slope of bielliptic fibrations 

      Barja Yáñez, Miguel Ángel (1997)
      Article
      Accés obert

    • TOPOLOGIA 

      Barja Yáñez, Miguel Ángel (Universitat Politècnica de Catalunya, 2014-06-03)
      Examen
      Accés restringit a la comunitat UPC

    • TOPOLOGIA (Examen 2n quadrim) 

      Barja Yáñez, Miguel Ángel (Universitat Politècnica de Catalunya, 2005-04-05)
      Examen
      Accés restringit a la comunitat UPC

    • Topologia. Apunts 

      Barja Yáñez, Miguel Ángel; Pascual Gainza, Pere; Roig Martí, Agustín; Carreras, Judit; Amorós Torrent, Jaume (Universitat Politècnica de Catalunya, 1998)
      Apunts
      Accés obert

    • Xiao's conjecture for general fibred surfaces 

      Barja Yáñez, Miguel Ángel; González Alonso, Víctor; Naranjo del Val, Joan Carles (2018-06-01)
      Article
      Accés obert
      We prove that the genus g, the relative irregularity qf and the Clifford index cf of a non-isotrivial fibration f satisfy the inequality qf=g-cf. This gives in particular a proof of Xiao’s conjecture for fibrations whose ...

    • Xiao's conjuecture for general fibred surfaces 

      Barja Yáñez, Miguel Ángel; González Alonso, Víctor; Naranjo del Val, Joan Carles (2014-01-10)
      Report de recerca
      Accés obert
      We prove that the genus g, the relative irregularity q_f and the Clifford index c_f of a non-isotrivial fibration f satisfy the inequality q_f=g-c_f. This gives in particular a proof of Xiao’s conjecture for fibrations ...