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Depósito Digital de Documentos de la UAB Encontrados 232 registros  1 - 10siguientefinal  ir al registro: La búsqueda tardó 0.01 segundos. 
1.
16 p, 265.2 KB Time-reversibility and integrability of p : −q resonant vector fields / Giné, Jaume (Universitat de Lleida. Departament de Matemàtica) ; Romanovski, Valery G. (University of Maribor. Center for Applied Mathematics and Theoretical Physics) ; Torregrosa, Joan (Universitat Autònoma de Barcelona. Departament de Matemàtiques)
We study the local analytical integrability in a neighborhood of p: −q resonant singular point of a two-dimensional vector field and its connection to time-reversibility with respect to the non-smooth involution ϕ(x, y) = (yp/q, xq/p). [...]
2024 - 10.3934/math.2024005
AIMS Mathematics, Vol. 9, Issue 1 (2024) , p. 73-88  
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2.
18 p, 334.8 KB Limit cycles of linear vector fields on (S2)m ×Rn / Cufí Cabré, Clara (Universitat Autònoma de Barcelona. Departament de Matemàtiques) ; Llibre, Jaume (Universitat Autònoma de Barcelona. Departament de Matemàtiques)
It is well known that linear vector fields defined in Rn cannot have limit cycles, but this is not the case for linear vector fields defined in other manifolds. We study the existence of limit cycles bifurcating from a continuum of periodic orbits of linear vector fields on manifolds of the form (S2)m × Rn when such vector fields are perturbed inside the class of all linear vector fields. [...]
2023 - 10.2140/pjm.2023.324.249
Pacific Journal of Mathematics, Vol. 324, Issue 2 (June 2023) , p. 249-263  
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3.
Proof Without Words : Tangent of π/8 / Gasull, Armengol (Universitat Autònoma de Barcelona. Departament de Matemàtiques)
2023 - 10.1080/07468342.2023.2238581
College Mathematics Journal, Vol. 54, Issue 4 (2023) , p. 385  
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4.
Projective transformations of convex bodies and volume product / Balacheff, Florent Nicolas (Universitat Autònoma de Barcelona. Departament de Matemàtiques) ; Solanes, Gil (Universitat Autònoma de Barcelona. Departament de Matemàtiques) ; Tzanev, Kroum (Universitat Autònoma de Barcelona. Departament de Matemàtiques)
In this paper, we study certain variational aspects of the volume product functional restricted to the space of small projective deformations of a fixed convex body. In doing so, we provide a short proof of a theorem by Klartag: a strong version of the slicing conjecture implies the non-symmetric Mahler conjecture. [...]
2024 - 10.1093/imrn/rnad310
International Mathematics Research Notices  
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5.
8 p, 292.2 KB On new infinite families of completely regular and completely transitive codes / Borges, J. (Joaquim) (Universitat Autònoma de Barcelona. Departament d'Enginyeria de la Informació i de les Comunicacions) ; Rifà i Coma, Josep (Universitat Autònoma de Barcelona. Departament d'Enginyeria de la Informació i de les Comunicacions) ; Zinoviev, Victor (Russian Academy of Sciences)
In two previous papers we constructed new families of completely regular codes by concatenation methods. Here we determine cases in which the new codes are completely transitive. For these cases we also find the automorphism groups of such codes. [...]
2024 - 10.1016/j.disc.2023.113840
Discrete Mathematics, Vol. 347, Issue 4 (April 2024) , art. 113840  
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6.
39 p, 451.5 KB Isosystolic inequalities for optical hypersurfaces / Alvarez Paiva, Juan Carlos (Université de Lille. Laboratoire Paul Painlevé) ; Balacheff, Florent Nicolas (Université de Lille. Laboratoire Paul Painlevé) ; Tzanev, Kroum (Université de Lille. Laboratoire Paul Painlevé)
We explore a natural generalization of systolic geometry to Finsler metrics and optical hypersurfaces with special emphasis on its relation to the Mahler conjecture and the geometry of numbers. In particular, we show that if an optical hypersurface of contact type in the cotangent bundle of the 2-dimensional torus encloses a volume V, then it carries a periodic characteristic whose action is at most V/3. [...]
2016 - 10.1016/j.aim.2016.07.003
Advances in mathematics, Vol. 301 (October 2016) , p. 934-972  
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7.
16 p, 496.2 KB Measurements of Riemannian two-disks and two-spheres / Balacheff, Florent Nicolas (Université de Lille. Laboratoire Paul Painlevé)
We prove that any Riemannian two-sphere having area at most 1 can be continuously mapped onto a tree in such a way that the topology of the fibers is controlled and their length is less than 7. 6. This result improves previous estimates and relies on a similar statement for Riemannian two-disks.
2015 - 10.2140/pjm.2015.275.167
Pacific Journal of Mathematics, Vol. 275, Num. 1 (April 2015) , p. 167-181  
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8.
14 p, 380.7 KB Systoles and diameters of hyperbolic surfaces / Balacheff, Florent Nicolas (Universitat Autònoma de Barcelona. Departament de Matemàtiques) ; Despré, Vincent (Université de Lorraine. Polytech Nancy) ; Parlier, Hugo (University of Luxembourg. Department of Mathematics)
In this article we explore the relationship between the systole and the diameter of closed hyperbolic orientable surfaces. We show that they satisfy a certain inequality, which can be used to deduce that their ratio has a (genus-dependent) upper bound.
2023 - 10.1215/21562261-2022-0040
Kyoto Journal of Mathematics, Vol. 63, Num. 1 (February 2023) , p. 211-222  
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9.
24 p, 2.7 MB A Discrete-Event Simheuristic for Solving a Realistic Storage Location Assignment Problem / Fuentes Leon, Jonas (Universitat Oberta de Catalunya. Departament d'Informàtica, Multimèdia i Telecomunicació) ; Li, Yuda (Universitat Politècnica de València. Departament d'Estadística Aplicada i Investigació Operativa) ; Peyman, Mohammad (Universitat Oberta de Catalunya. Departament d'Informàtica, Multimèdia i Telecomunicació) ; Calvet Liñan, Laura (Universitat Autònoma de Barcelona. Departament de Telecomunicació i Enginyeria de Sistemes) ; Juan, Ángel A. (Universitat Politècnica de València. Departament d'Estadística Aplicada i Investigació Operativa)
In the context of increasing complexity in manufacturing and logistic systems, the combination of optimization and simulation can be considered a versatile tool for supporting managerial decision-making. [...]
2023 - 10.3390/math11071577
Mathematics, Vol. 11, Issue 7 (April 2023) , art. 1577  
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10.
54 p, 1.0 MB Topological Moduli Space for Germs of Holomorphic Foliations / Marín Pérez, David (Universitat Autònoma de Barcelona. Departament de Matemàtiques) ; Mattei, Jean-François (Institut de Mathématiques de Toulouse) ; Salem, Eliane (Sorbonne Université. Institut de Mathématiques de Jussieu-Paris Rive Gauche)
This work deals with the topological classification of germs of singular foliations on (ℂ2,0). Working in a suitable class of foliations we fix the topological invariants given by the separatrix set, the Camacho-Sad indices, and the projective holonomy representations and we compute the moduli space of topological classes in terms of the cohomology of a new algebraic object that we call group-graph. [...]
2020 - 10.1093/imrn/rny244
International Mathematics Research Notices, Vol. 2020, Issue 23 (November 2020) , p. 9228-9292  
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