All a b c d e f g h i j k l m n o p q r s t u v w x y z Other

Page 1 Next

Displaying 1 – 20 of 663

Showing per page

C 55 -groups.

Dolfi, Silvio, Jabara, Enrico, Lucido, Maria Silvia (2004)

Sibirskij Matematicheskij Zhurnal

Calcolo della funzione di partizione di Kostant

Stefano Capparelli (2003)

Bollettino dell'Unione Matematica Italiana

Forniamo un calcolo esplicito della funzione di partizione di Kostant per algebre di Lie complesse di rango 2 . La tecnica principale consiste nella riduzione a casi più semplici ed all'uso di funzioni generatrici.

Cambrian fans

Nathan Reading, David E. Speyer (2009)

Journal of the European Mathematical Society

For a finite Coxeter group W and a Coxeter element c of W ; the c -Cambrian fan is a coarsening of the fan defined by the reflecting hyperplanes of W . Its maximal cones are naturally indexed by the c -sortable elements of W . The main result of this paper is that the known bijection cl c between c -sortable elements and c -clusters induces a combinatorial isomorphism of fans. In particular, the c -Cambrian fan is combinatorially isomorphic to the normal fan of the generalized associahedron for W . The rays...

Cancellation of direct products of digraphs

Richard H. Hammack, Katherine E. Toman (2010)

Discussiones Mathematicae Graph Theory

We investigate expressions of form A×C ≅ B×C involving direct products of digraphs. Lovász gave exact conditions on C for which it necessarily follows that A ≅ B. We are here concerned with a different aspect of cancellation. We describe exact conditions on A for which it necessarily follows that A ≅ B. In the process, we do the following: Given an arbitrary digraph A and a digraph C that admits a homomorphism onto an arc, we classify all digraphs B for which A×C ≅ B×C.

Canonical Brauer induction and symmetric groups

Robert Boltje, Burkhard Külshammer (2005)

Bollettino dell'Unione Matematica Italiana

Imitating the approach of canonical induction formulas we derive a formula that expresses every character of the symmetric group as an integer linear combination of Young characters. It is different from the well-known formula that uses the determinantal form.

Canonical characters on simple graphs

Tanja Stojadinović (2013)

Czechoslovak Mathematical Journal

A multiplicative functional on a graded connected Hopf algebra is called the character. Every character decomposes uniquely as a product of an even character and an odd character. We apply the character theory of combinatorial Hopf algebras to the Hopf algebra of simple graphs. We derive explicit formulas for the canonical characters on simple graphs in terms of coefficients of the chromatic symmetric function of a graph and of canonical characters on quasi-symmetric functions. These formulas and...

Capacités de Choquet finies et profinies

Pablo Dartnell, Gérard Michon (1998)

Annales de l'institut Fourier

On définit les capacités de Choquet dans le cas fini en utilisant une forme bilinéaire non dégénérée associée à la base de Choquet. On montre que, dans le cas fini, une capacité de Choquet est la donnée d’un convexe de mesure qu’on caractérise. Le cas profini, issu des arbres, est obtenu par passage à la limite projective du cas fini. Sur les capacités profinies, on définit une forme bilinéaire dont le rapport avec l’intégration, dans des cas simples, est étudié.

Capturing forms in dense subsets of finite fields

Brandon Hanson (2013)

Acta Arithmetica

An open problem of arithmetic Ramsey theory asks if given an r-colouring c:ℕ → 1,...,r of the natural numbers, there exist x,y ∈ ℕ such that c(xy) = c(x+y) apart from the trivial solution x = y = 2. More generally, one could replace x+y with a binary linear form and xy with a binary quadratic form. In this paper we examine the analogous problem in a finite field q . Specifically, given a linear form L and a quadratic form Q in two variables, we provide estimates on the necessary size of A ⊂ q to guarantee...

Currently displaying 1 – 20 of 663

Page 1 Next