Sökning: "Poincaré polynomial"

Hittade 3 avhandlingar innehållade orden Poincaré polynomial.

  1. 1. Enumerative combinatorics related to partition shapes

    Författare :Jonas Sjöstrand; Anders Björner; Christian Krattenthaler; KTH; []
    Nyckelord :NATURAL SCIENCES; NATURVETENSKAP; partition shape; sign-imbalance; Robinson-Schensted correspondence; chess tableau; restricted word; cylindrical lattice walk; Poincaré polynomial; Bruhat interval; rook polynomial; pattern avoidance; partitionsform; teckenobalans; Robinson-Schensted-korrespondens; schacktablå; begränsade ord; cylindriska latticestigar; poincarépolynom; bruhatintervall; tornpolynom; mönsterundvikande permutation; MATHEMATICS; MATEMATIK;

    Sammanfattning : This thesis deals with enumerative combinatorics applied to three different objects related to partition shapes, namely tableaux, restricted words, and Bruhat intervals. The main scientific contributions are the following. LÄS MER

  2. 2. Minimal models in algebra, combinatorics and topology

    Författare :Alexander Berglund; Torsten Ekedahl; Alexandru Suciu; Stockholms universitet; []

    Sammanfattning : The thesis consists of seven papers.In Paper I, II, III, IV and V, we study homological invariants of monomial rings — rings of the form R = k[x1, . . . LÄS MER

  3. 3. Decomposition of perverse sheaves

    Författare :Iara Cristina Alvarinho Gonçalves; Rikard Bögvad; Nero Budur; Stockholms universitet; []
    Nyckelord :NATURAL SCIENCES; NATURVETENSKAP; Sheaf cohomology; hyperplane arrangements; D-modules; matematik; Mathematics;

    Sammanfattning : This PhD thesis consists in three papers in which we describe irreducibility conditions and the number of factors in a composition series of certain perverse sheaves. We study some particular cases, providing examples and showing how to explicitly use perverse sheaves to obtain precise results. LÄS MER