DSpace collection: Prepublicacions del Centre de Recerca Matemàtica

On the growth rate of minor-closed classes of graphs

Sat, 29 Dec 2007 22:58:59 GMT

title: On the growth rate of minor-closed classes of graphs authors: Bernardi, Olivier; Noy, Marc; Welsh, Dominic
abstract: "Vegeu el resum a l'inici del document del fitxer adjunt."

The generic Hanna Neumann conjecture and post correspondence problem

Sat, 29 Mar 2008 22:58:59 GMT

title: The generic Hanna Neumann conjecture and post correspondence problem authors: Ciobanu, Laura; Martino, Armando; Ventura, Enric
abstract: "Vegeu el resum a l'inici del document del fitxer adjunt."

Convolution inequalities in Lorentz spaces

Sat, 29 Mar 2008 22:58:59 GMT

title: Convolution inequalities in Lorentz spaces authors: Nursultanov, Erlan; Tikhonov, Sergey Yu.
abstract: In this paper we study boundedness of the convolution operator in different Lorentz spaces. In particular, we obtain the limit case of the Young-O'Neil inequality in the classical Lorentz spaces. We also investigate the convolution operator in the weighted Lorentz spaces. Finally, norm inequalities for the potential operator are presented.

Horospheres in hyperbolic geometry

Sat, 29 Mar 2008 22:58:59 GMT

title: Horospheres in hyperbolic geometry authors: Gallego Gómez, Eduardo; Reventós i Tarrida, Agustí; Solanes Farrés, Gil; Teufel, E.
abstract: In this paper we investigate the role of horospheres in Integral Geometry and Differential Geometry. In particular we study envelopes of families of horocycles by means of “support maps”. We define invariant “linear combinations” of support maps or curves. Finally we obtain Gauss-Bonnet type formulas and Chern-Lashof type inequalities.