Sökning: "galois"

Visar resultat 1 - 5 av 7 avhandlingar innehållade ordet galois.

  1. 1. Other Things Besides Number : Abstraction, Constraint Propagation, and String Variable Types

    Författare :Joseph Scott; Pierre Flener; Parosh Abdulla; Justin Pearson; Michel Rueher; Uppsala universitet; []
    Nyckelord :NATURAL SCIENCES; NATURVETENSKAP; NATURVETENSKAP; NATURAL SCIENCES; constraint programming; string constraint problems; Galois connections; abstraction; constraint propagation; computer-aided verification applications; Datavetenskap; Computer Science;

    Sammanfattning : Constraint programming (CP) is a technology in which a combinatorial problem is modeled declaratively as a conjunction of constraints, each of which captures some of the combinatorial substructure of the problem. Constraints are more than a modeling convenience: every constraint is partially implemented by an inference algorithm, called a propagator, that rules out some but not necessarily all infeasible candidate values of one or more unknowns in the scope of the constraint. LÄS MER

  2. 2. On the Clebsch-Gordan problem for quiver representations

    Författare :Martin Herschend; Ernst Dieterich; Alex Martsinkovsky; Karin Erdmann; Uppsala universitet; []
    Nyckelord :NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURVETENSKAP; NATURAL SCIENCES; Algebra and geometry; quiver; quiver representation; tensor product; Clebsch-Gordan problem; representation ring; bialgebra; Galois covering; Algebra och geometri;

    Sammanfattning : On the category of representations of a given quiver we define a tensor product point-wise and arrow-wise. The corresponding Clebsch-Gordan problem of how the tensor product of indecomposable representations decomposes into a direct sum of indecomposable representations is the topic of this thesis. LÄS MER

  3. 3. Arithmetic of three-point covers

    Författare :Björn Selander; Siegfried Bosch; Uppsala universitet; []
    Nyckelord :Algebra and geometry; Algebra och geometri;

    Sammanfattning : Any cover of the Riemann sphere with rational branch points is known to be defined over the algebraic numbers. Hence the Galois group of the rationals acts on the category of such branched covers. Particulars about this action are still scarce, even in the simplest non-abelian case, the case with just three branch points. LÄS MER

  4. 4. Abelian affine group schemes, plethories, and arithmetic topology

    Författare :Magnus Carlson; Tilman Bauer; Minhyong Kim; KTH; []
    Nyckelord :NATURAL SCIENCES; NATURVETENSKAP;

    Sammanfattning : In Paper A we classify plethories over a field of characteristic zero. All plethories over characteristic zero fields are ``linear", in the sense that they are free plethories on a bialgebra. For the proof of this classification we need some facts from the theory of ring schemes where we extend previously known results. LÄS MER

  5. 5. Stable reduction of curves and tame ramification

    Författare :Lars Halvard Halle; Carel Faber; Bas Edixhoven; KTH; []
    Nyckelord :NATURAL SCIENCES; NATURVETENSKAP; MATHEMATICS; MATEMATIK;

    Sammanfattning : This thesis treats various aspects of stable reduction of curves, and consists of two separate papers. In Paper I of this thesis, we study stable reduction of curves in the case where a tamely ramified base extension is sufficient. LÄS MER