Now showing items 1-20 of 32

  • ÀLGEBRA MULTILINEAL i GEOMETRIA 

    Barja Yáñez, Miguel Ángel (Universitat Politècnica de Catalunya, 2017-01-10)
    Exam
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  • ÀLGEBRA MULTILINEAL i GEOMETRIA 

    Barja Yáñez, Miguel Ángel (Universitat Politècnica de Catalunya, 2018-01-12)
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  • ÀLGEBRA MULTILINEAL i GEOMETRIA 

    Barja Yáñez, Miguel Ángel (Universitat Politècnica de Catalunya, 2017-11-09)
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  • ÀLGEBRA MULTILINEAL i GEOMETRIA 

    Barja Yáñez, Miguel Ángel (Universitat Politècnica de Catalunya, 2017-07-06)
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  • A note on a conjecture of Xiao 

    Barja Yáñez, Miguel Ángel; Zucconi, Franco (1998)
    Article
    Open Access
  • A note on a question of Fujita and a conjecture of Xiao 

    Barja Yáñez, Miguel Ángel (1998)
    Article
    Open Access
  • Experiència pràctica de comunicació de Matemàtiques a la ciutadania i a secundària – 2a fase 

    Alberich Carramiñana, Maria; Barja Yáñez, Miguel Ángel; Borràs Sol, Júlia; Plans Berenguer, Bernat; Quer Bosor, Jordi; Thomas, Federico; Torras, Carme; Xambó Descamps, Sebastián (Universitat Politècnica de Catalunya. Institut de Ciències de l'Educació, 2013-02-08)
    Conference report / Conference lecture
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    El projecte implementa experiències pràctiques dels estudis universitaris de matemàtiques (grau, llicenciatura i màsters) en l'àmbit de la docència i la divulgació científica. La finalitat divulgativa pretén fomentar ...
  • Extension of maps defined on many fibres 

    Barja Yáñez, Miguel Ángel; Naranjo, J. C. (1997)
    Article
    Open Access
    Let S be a fibred surface. We prove that the existence of morphisms from non countably many fibres to curves implies, up to base change, the existence of a rational map from S to another surface fibred over the same base ...
  • Generalized Clifford-Severi inequality and the volume of irregular varieties 

    Barja Yáñez, Miguel Ángel (2015-02-15)
    Article
    Open Access
    We give a sharp lower bound for the self-intersection of a nef line bundle L on an irregular variety X in terms of its continuous global sections and the Albanese dimension of X, which we call the generalized Clifford-Severi ...
  • Generalized Clifford-Severi inequality and the volume of irregular varieties 

    Barja Yáñez, Miguel Ángel (2013-03-02)
    External research report
    Restricted access - author's decision
    We give a sharp lower bound for the selfintersection of a nef li ne bundle L on an irregular variety X in terms of its continuous global sections and the Albanese dim ension of X, which we call the Generalized Clifford-Severi ...
  • GEOMETRIA AFÍ I EUCLIDIANA 

    Barja Yáñez, Miguel Ángel (Universitat Politècnica de Catalunya, 2012-05-30)
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  • GEOMETRIA AFÍ I EUCLIDIANA 

    Barja Yáñez, Miguel Ángel (Universitat Politècnica de Catalunya, 2019-04-01)
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  • GEOMETRIA AFÍ I EUCLIDIANA 

    Barja Yáñez, Miguel Ángel (Universitat Politècnica de Catalunya, 2012-03-20)
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  • GEOMETRIA AFÍ I EUCLIDIANA 

    Barja Yáñez, Miguel Ángel (Universitat Politècnica de Catalunya, 2012-06-27)
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  • Numerical Bounds of Canonical Varieties 

    Barja Yáñez, Miguel Ángel (1998)
    Article
    Open Access
    We study surfaces and threefolds whose canonical maps are birational (canonical surfaces and threefolds). In the case of canonical surfaces we prove that the known inequlity for its invariants is not sharp if the surface ...
  • On a conjecture of Fujita 

    Barja Yáñez, Miguel Ángel (2000)
    Article
    Open Access
  • On the bicanonical map of irregular varieties 

    Barja Yáñez, Miguel Ángel; Lahoz Vilalta, Martí; Naranjo del Val, Joan Carles; Pareschi, Giusseppe (2010-02)
    External research report
    Open Access
    From the point of view of uniform bounds for the birationality of pluricanonical maps, irregular varieties of general type and maximal Albanese dimension behave similarly to curves. In fact Chen-Hacon showed that, at least ...
  • On the slope of bielliptic fibrations 

    Barja Yáñez, Miguel Ángel (1997)
    Article
    Open Access
    Let $\pi :S\longrightarrow B$ be a bielliptic fibration. We prove $S$ is, up to base change, a rational double cover of an elliptic fibration and that $\pi $ is isotrivial provided it is smooth. Finally, we prove that the ...
  • On the slope of fibred surfaces 

    Barja Yáñez, Miguel Ángel; Zucconi, Franco (2000)
    Article
    Open Access
    We give an asymptotically sharp lower bound for the slope $\lambda (f)$ of a fibration $f:S\longrightarrow B$, where $S$ is a surface and $B$ is a curve, if there exists an involution on the general fibre $F$ of $f$. ...
  • On the slope of fibred surfaces 

    Barja Yáñez, Miguel Ángel; Zucconi, Franco (1998)
    Article
    Open Access