Jorge Luis Ramírez Alfonsín

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Articles de recherche / Research papers Positive links with arrangements of pseudocircles as shadows (avec/ with C. Medina, S. Ramírez, G. Salazar), soumis (arXiv:2312.13808) Borsuk and Vázsonyi problems through Reuleaux polyhedra (avec/ with G. López-Campos, D. Oliveros), soumis (arXiv:2308.03889) Links in orthoplicial Apollonian packings (avec/ with I. Rasskin), soumis (arXiv:2301.03089) A polytopal generalization of Apollonian packings and Descartes' theorem (avec/ with I. Rasskin), soumis (arXiv: 2107.09432) The 10 antipodal pairings of strongly involutive polyhedra on the sphere (avec/ with J. Bracho, L. Montejano, E. Pauli), Bull. Math. Soc. Sci. Math. Roumanie, 67(115) (2) (2024), 139-155 Self-dual maps III: projective links (avec/ with L. Montejano, I. Rasskin), Journal of Knot Theory and its Ramifications , 32(10) (2023) No 2350066, 22 pp On the number of vertices of projective polytopes (avec/ with N. García-Colín, L.P. Montejano), Mathematika, 69(2) (2023), 535-561 Self-dual maps II: links and symmetry (avec/ with L. Montejano, I. Rasskin), SIAM Discrete Mathematics, 37(1) (2023), 191-220 On the period collapse of a family of Ehrhart quasi-polynomials (avec/ with C.G. Fernandes, J.C. de Pina, S. Robins), Combinatorial Theory, 2(3) (2022) #12 The square Frobenius number (avec/ with J. Chappelon), Semigroup Forum, 105 (2022), 149-171 Self-dual maps I: antipodality (avec/ with L. Montejano, I. Rasskin), SIAM Discrete Mathematics, 36(3) (2022), 1551-1566 Strongly involutive self-dual polyhedra (avec/ with J. Bracho, L. Montejano, E. Pauli), Ars Mathematica Contemporanea, 20 (2021), 143-149 Ball packing for links (avec/ with I. Rasskin), European J. Comb., 96 (2021), 103351. Cubic graphs, their Ehrhart quasi-polynomials, and a scissors congruence phenomenon (avec/ with C.G. Fernandes, J.C. de Pina, S. Robins), Discrete and Computational Geometry, 65 (2021), 227-243. Primes in numerical semigroups (avec/ with M. Skalba), Compte Rendu de l’Académie des Sciences - Mathématique, 358(9-10) (2020), 1001-1004. The unavoidable arrangements of pseudocircles (avec/ with C. Medina, G. Salazar), Proceedings of the American Mathematical Society, 147(7) (2019), 3165-3175 On the number of unknot diagrams (avec/ with C. Medina, G. Salazar), SIAM J. Discrete Mathematics, 33(1) (2019), 306-326 Counting Hamiltonian cycles in the matroid basis graph (avec/ with C.G. Fernandes, C. Hernández-Vélez, J.C. de Pina), Graphs and Combinatorics, 35(2) (2019), 539-550 On lattice path matroid polytopes: integer points and Ehrhart polynomial (avec/ with L. Martinez-Sandoval, K. Knauer), Discrete and Computational Geometry, 60(3) (2018), 698-719 How many circuits determine an oriented matroid ? (avec/ with L. Montejano, K. Knauer), Combinatorica, 38(4) (2018), 861-885 Codimension two and three Kneser transversals (avec/ with J. Chappelon, L. Martinez-Sandoval, L. Montejano, L.P. Montejano), SIAM J. Discrete Mathematics, 32 (2018), 1351-1363 A Tutte polynomial inequality for lattice path matroids (avec/ with L. Martinez-Sandoval, K. Knauer), Adv. in Appl. Math., 94 (2018), 23-38 Integral points in rational polygons: a numerical semigroup approach (avec/ with G. Márquez-Campos, J.M. Tornero), Semigroup Forum, 94(1) (2017), 123-138 Numerical semigroups II: pseudo-symmetric AA-semigroups (avec/ with I. García-Marco, Ø. Rødseth), Journal of Algebra, 470 (2017), 484-498 Complete Kneser Transversals (avec/ with J. Chappelon, L. Martinez-Sandoval, L. Montejano, L.P. Montejano), Adv. in Appl. Math., 82 (2017), 83-101 On Ramsey numbers of complete graphs with dropped stars (avec/ with J. Chappelon, L. Montejano), Discrete Applied Mathematics, 210 (2016), 200-206 Edge separators for quasi-binary trees (avec/ with S. Tishchenko), Discrete Applied Mathematics, 210 (2016), 284-289 Detecting minors in matroids through triangles (avec/ with B. Albar, D. Gonçalvez), European Journal of Combinatorics, 53 (2016), 50-58 Matroid toric ideal: complete intersection, minors and minmal systems of generators (avec/ with I. García-Marco), SIAM J. Discrete Mathematics, 29(4) (2015), 2267-2276 Connected covering numbers (avec/ with J. Chappelon, L. Montejano, K. Knauer ), Journal of Combinatorial Designs, 23(12) (2015), 534-549 Möbius function of semigroup poset through Hilbert series (avec/ with J. Chappelon, I. García-Marco, L. Montejano), J. Combinatorial Theory Ser. A, 136 (2015), 238-251 Roudneff's conjecture for Lawrence oriented matroid (avec/ with L. Montejano), The Electronic Journal of Combinatorics 22(2) (2015), # P2.3 Matroid base polytope decomposition II: sequences of hyperplane splits (avec/ with V. Chatelain), Adv. in Appl. Math., 54 (2014), 121-136 On the Möbius function of the locally finite poset associated with a numerical semigroup (avec/ with J. Chappelon ), Semigroup Forum, 87(2) (2013), 313-330 On the number of numerical semigroups of prime power genus (avec/ with S. Eliahou ), Semigroup Forum, 87(1) (2013), 171-186 El problema diofántico de Frobenius, La Gaceta de la Real Sociedad Matemática Española, 16(1) (2013), 117-129 The switching game on unions of oriented matroids (avec/ with V. Chatelain), European J. Combinatorics, 33(2) (2012), 215-219 Two-generator numerical semigroups and Fermat and Marsenne numbers (avec/ with S. Eliahou ), SIAM J. Discrete Mathematics, 25 (2011), 622-630 Transversals to the convex hulls of all k-sets of discrete subsets of R^n (avec/ with J. Arocha, J. Bracho, L. Montejano), J. Comb. Th. Ser. A, 118(1) (2011), 197-207 Matroid base polytope decomposition (avec/ with V. Chatelain), Adv. in Appl. Math., 47 (2011), 158-172 Numerical Semigroups: Apery sets and Hilbert series (avec/ with Ø.J. Rødseth), Semigroup Forum, 79 (2) (2009), 323-340 Spatial graphs, knots and the cyclic polytope, Contributions to Algebra and Geometry (Beitrage zur Algebra und Geometrie), 49 (2) (2008), 301-314 Gaps in semigroups, Discrete Mathematics, 308 (18) (2008), 4177-4184 On the Frobenius number of Fibonacci numerical semigroups (avec/ with J.M. Marin, M.P. Revuelta), INTEGERS, 7 (2007), # A14 (7 pages) Knots and links in spatial graphs: A Survey, Discrete Mathematics, 302 (1-3) (2005), 225-242 Embeddability of the combinohedron (avec/ with D. Romero), Discrete Mathematics, 254 (2002), 473-483 Disconnected coverings for oriented matroids via simultaneous mutations (avec/ with D. Forge, H. Yeun), Discrete Mathematics, 258 (2002), 353-359 On reconstructing arrangements from their sets of simplices (avec/ with D. Forge), Discrete Mathematics, 226 (2001), 175-190 On counting the k-face cells of cyclic arrangements (avec/ with D. Forge), European J. Combinatorics, 22 (2001), 307-312 Lawrence oriented matroids and a problem of McMullen on projective equivalences of polytopes, European J. Combinatorics, 22 (2001), 723-731 On linked spatial representations, Journal of Knot Theory and Its Ramifications, 10 (1) (2001), 143-150 Spatial graphs and oriented matroids: the trefoil, Discrete and Computational Geometry , 22 (1999), 149-158 Gracefulness of replicated paths and cycles, Ars Combinatoria, 53 (1999), 257-269 Cyclic arrangements and Roudneff's conjecture in the space, Information Processing Letters, 71 (1999), 179-182 Straight line arrangements in the real projective plane (avec/ with D. Forge), Discrete and Computational Geometry, 20 (1998), 155-161 Connected coverings and an application to oriented matroids (avec/ with D. Forge), Discrete Mathematics, 187 (1998), 109-121 On variations of the subset sum problem, Discrete Applied Mathematics, 81 (1998), 1-7 A special arrangement with minimal number of triangles, Information Processing Letters, 67 (1998), 273-276 The spread of $K_n$, Discrete Mathematics, 175 (1997), 221-229 Complexity of the Frobenius problem, Combinatorica, 16 (1) (1996), 143-147 Cycle decompositions of complete and complete multipartite graphs, Australasian Journal of Combinatorics, 11 (1995), 233-238 Sharing jugs of wine (avec/ with C.J.H. McDiarmid ), Discrete Mathematics, 125 (1994), 279-287 Chapitres de livre / Chapters in books Théorie des matroïdes et des matroïdes orientés (avec/ with E. Gioan), Informatique Mathématique DGR IM, (ed. Ph. Langlois), Presses Universitaires de Perpignan, (2013), 47-96 A tiling problem and the Frobenius number (avec/ with D. Labrousse), Additive Number Theory : Melvyn Nathanson Fetschrift, (eds. D. Chudnovsky, G. Chudnovsky), Springer-Verlag (2010), 203-220 On the unknotting problem, Complexity and Chance, (eds. C.H. McDiarmid and G.R. Grimmet) Lectures in Math. and Appl. Vol. 34, Oxford University Press (2007), 260-271 Bases et généralités (appendice) (avec/ with J.-C. Fournier ), Graphes et Applications 1, (ed. J.-C. Fournier), Hermes Sci. Pub. Ltd, (2007), 17-64 Graphes et probabilités (avec/ with J.-C. Fournier, F. de la Vega), Graphes et Applications 2, (ed. J.-C. Fournier), Hermes Sci. Pub. Ltd, (2007), 161-193 Genesis and origins (avec/ with C. Berge), dans Perfect Graphs (eds. J.L. Ramírez Alfonsín and B. Reed) Wiley and Sons, (2001), 1-12 Autres / Others Ramsey for complete graphs with a dropped edge or a triangle (avec/ with J. Chappelon, L. Montejano), LAGOS'17-IX Latin and American Algorithms, Graphs and Optimization, 21-25, Electron. Notes Discrete Math., 62, Elsevier Sci. B. V., Amsterdam, 2017. Combinatorial geometries: matroids, oriented matroids and applications: preface (avec/ with R. Cordovil , K. Fukuda, E. Gioan) European J. Combinatorics, 50 (2015), 1-3 Sobre un problema de Frobenius, Laberintos & infinitos, 32 (2013), 5-8 Topological and Geometric Graph Theory: preface (avec/ with A. Machí, J. Nesetril, P. Ossona de Mendez), European J. Combinatorics, 33 (3) (2012), 277-278 Combinatorial geometries and applications: oriented matroids and matroids: preface (avec/ with R. Cordovil), European J. Combinatorics, 30 (8) (2009), 1725-1726 Pruebas de conocimiento cero, Misceleanea Matematica, 22 (1995), 55-56 Criptografia, Ciencia y Desarrollo, 121 (1995), 94-95 The Maya and the conception of Mixbaal (avec/ with S. Testard), Mathematics in School, 24 (1995), 8-9