Search for dissertations about: "Jonas Sjöstrand"

Found 2 swedish dissertations containing the words Jonas Sjöstrand.

2. 1. Enumerative combinatorics related to partition shapes

   Author : Jonas Sjöstrand; Anders Björner; Christian Krattenthaler; KTH; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; 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;

   Abstract : 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. READ MORE

4. 2. Generalised Ramsey numbers and Bruhat order on involutions

   Author : Mikael Hansson; Axel Hultman; Jan Snellman; Jonas Sjöstrand; Linköpings universitet; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES;

   Abstract : This thesis consists of two papers within two different areas of  combinatorics.Ramsey theory is a classic topic in graph theory, and Paper A deals with two of its most fundamental problems: to compute Ramsey numbers and to characterise critical graphs. More precisely, we study generalised Ramsey numbers for two sets Γ1 and Γ2 of cycles. READ MORE