Fyrirlesari: Sergey Kitaev frá Háskólanum í Strathclyde Titill: Singleton mesh patterns in multidimensional permutations Staður og stund: VR-II V-147, kl. 10:00 miðvikudaginn 28. ágúst 2024 Ágrip: Permutation patterns is a popular area of research introduced in 1968, but with roots going to the work of Leonhard Euler in 1749. In this talk, I will present […]
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Fyrirlesari: Gabor Tardos frá Renyi stofnuninni Búdapest Titill: Extremal theory of 0-1 matrices Staðsetning og tími: Askja, N-128, kl. 10:00 mánudaginn 26. ágúst 2024 Ágrip: We say that a a 0-1 matrix A contains another such matrix (pattern) P if P can be obtained from a submatrix of A by possibly changing a few 1
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Heiti verkefnis: Tölvuaðstoð við tilgátur í fléttufræði Nemandi:Atli Fannar Franklín Doktorsnefnd: Anders Claesson, prófessor við Raunvísindadeild HÍ (leiðbeinandi) Henning Úlfarsson, prófessor og deildarforseti Tölvunarfræðideildar Háskólans í Reykjavík Sigurður Örn Stefánsson, prófessor við Raunvísindadeild HÍ Sergey Kitaev, prófessor, University of Strathclyde Ágrip: Atli Fannar Franklín fer yfir framvindu við þróun tölvukerfisins PERQ, sem vinnur með veldaraðir
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8. february, kl. 11:40, í Oddi O-106 Fyrirlesari: Anders Claesson, Háskóli Íslands. Titill: Permutations with few inversions Ágrip: We consider permutations of [n] with at most n inversions; this is what we mean by permutation with few inversions. In particular, we present a curious generating function for permutations of [n] with exactly n inversion. Furthermore,
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Málstofa 12 september, kl. 10:50 (athugið óvenjulega tímasetningu!) Fyrirlesari: Gordon Slade (University of British Columbia)Titill: Self-avoiding walk, spin systems, and renormalisationÁgrip: The subject of critical phenomena in statistical mechanics is a rich source of interesting and difficult mathematical problems that touch oncombinatorics, probability, and mathematical physics. Self-avoiding walks and lattice spin systems provide fundamental examples. This
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Næsta málstofa verður þriðjudaginn 13. júní kl 13:20 í Naustinu, húsi Endurmenntunar. Fyrirlesari er Dana C. Ernst (Northern Arizona University). Titill fyrirlestrarins er Enumerating signed permutations by reversal distance. Ágrip: A signed permutation is a permutation of the numbers 1 through $n$ in which each number is signed. A reversal of a signed permutation is
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Sjötta málstofa haustsins verður föstudaginn 21. október kl 10:30 í Naustinu, húsi Endurmenntunar. Fyrirlesari er Anders Karl Claeson, Háskóla Íslands. Titill hans er Pattern rewriting systems. (Fyrirlesturinn er óbeint framhald að fyrirlestri í síðustu viku.) Abstract. Linton, Propp, Roby and West (2012) initiated the systematic study of equivalence relations induced by pattern replacement. They considered
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Fimmta málstofa haustsins verður föstudaginn 14. október kl 10:30 í Naustinu, húsi Endurmenntunar. Fyrirlesari er Anders Karl Claeson, Háskóla Íslands. Titill hans er The Goulden-Jackson cluster method. Anders mun halda áfram með sama efni föstudaginn 21. október. Abstract. We consider the problem of calculating the number of strings of length n (over a fixed alphabet) that do not contain
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Fyrsta málstofa haustsins verður föstudaginn 23. september kl 10:30 í Naustinu húsi Endurmenntunar. Fyrirlesari er Atli Fannar Franklín, Raunvísindastofnun háskólans. Titill hans er Counting score sequences. Abstract: The score sequence of a tournament is the sequence of the out-degrees of its vertices arranged in nondecreasing order. The problem of counting score sequences of a tournament
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Málstofa í stærðfræði Fyrirlesari: Duncan Alexander Adamson, Háskólinn í Reykjavík Titill: Combinatorial Structures for Crystal Structure Prediction Staðsetning: Tg-227 í Tæknigarði. Tímasetning: Fimmtudaginn 17. mars 2022, kl. 10:30. Ágrip: Crystals are a fundamental form of matter defined by a periodic structure with a high level of symmetry. The relatively small period of crystals allows the
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