Sökning: "Lie groups"

Visar resultat 21 - 25 av 60 avhandlingar innehållade orden Lie groups.

  1. 21. The Whittaker model of the center of the quantum group and Hecke algebras

    Författare :Alexei Sevostianov; Uppsala universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Theoretical physics; Teoretisk fysik; Physics; Fysik; Theoretical Physics; teoretisk fysik;

    Sammanfattning : In 1978 Kostant suggested the Whittaker model of the center of the universal enveloping algebra U(g) of a complex simple Lie algebra g. An essential role in this construction is played by a non-singular character χ of the maximal nilpotent subalgebra n+ ⊂ g. LÄS MER

  3. 22. Amenable-like properties of étale groupoids

    Författare :Gabriel Favre; Sven Raum; Nadia Larsen; Stockholms universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Etale groupoids; Representation theory; amenability; inverse semigroups; C*-algebra; matematik; Mathematics;

    Sammanfattning : This thesis consists of three papers related to analytic and representation theoretic properties of étale groupoids.In the first paper, we characterize algebraically the type I and CCR property for ample groupoids and their non-commutative duals: Boolean inverse semigroups. Our results use and generalize Thoma’s work on discrete groups. LÄS MER

  4. 23. Algorithmic Methods in Combinatorial Algebra

    Författare :Anna Torstensson; Algebra; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; algebraic geometry; field theory; Number Theory; maximal symmetry group; resultant; SAGBI basis; Orthogonal decomposition; algebra; group theory; Talteori; fältteori; algebraisk geometri; gruppteori;

    Sammanfattning : This thesis consists of a collection of articles all using and/or developing algorithmic methods for the investigation of different algebraic structures. Part A concerns orthogonal decompositions of simple Lie algebras. The main result of this part is that the symplectic Lie algebra C3 has no orthogonal decomposition of so called monomial type. LÄS MER

  5. 24. Hopf Invariants in Real and Rational Homotopy Theory

    Författare :Felix Wierstra; Alexander Berglund; Urtzi Buijs; Stockholms universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Rational homotopy theory; Real homotopy theory; operads; Hopf invariants; Mathematics; matematik;

    Sammanfattning : In this thesis we use the theory of algebraic operads to define a complete invariant of real and rational homotopy classes of maps of topological spaces and manifolds. More precisely let f,g : M -> N be two smooth maps between manifolds M and N. LÄS MER

  7. 25. Förändringsprocesser i kommunal organisation : En studie av organisering och meningsskapande i två förvaltningar

    Författare :Elinor Edvardsson Stiwne; Per-Erik Ellström; Linköpings universitet; []
    Nyckelord :SAMHÄLLSVETENSKAP; SOCIAL SCIENCES; organisationsförändring; förändringsprocesser; kommunal organisation; kommun i förändring; Administrative procedure; Förvaltningsprocess;

    Sammanfattning : Planned change is exercised at different stages; planning, implementation and evaluation. The point of departure for this study is the planning stage of an organisational change in a local government. The planning stage is divided into three theoretical stages; anticipation, culmination and the aftermath. LÄS MER