Exploració per autor "Barja Yáñez, Miguel Ángel"
Ara es mostren els items 36-48 de 48
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Positivity properties of relative complete intersections
Barja Yáñez, Miguel Ángel; Stoppino, Lidia (2014-10)
Report de recerca
Accés obertWe give conditions for f-positivity of relative complete intersections in projective bundles. We also derive an instability result for the fibres. -
Slope inequalities for fibrations of non-maximal Albanese dimension
Barja Yáñez, Miguel Ángel (2021-06-15)
Article
Accés obertWe 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'editorialWe 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 obertWe 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 obertLet 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 obertLet 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 obertWe 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 obertWe 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 ...