http://hdl.handle.net/2072/1176 http://www.recercat.net/retrieve/2445 http://hdl.handle.net/2072/1176 Search the Channel s http://www.recercat.net/simple-search http://hdl.handle.net/2072/12526 title: On the growth rate of minor-closed classes of graphs authors: Bernardi, Olivier; Noy, Marc; Welsh, Dominic <br>abstract: "Vegeu el resum a l'inici del document del fitxer adjunt." <br> http://hdl.handle.net/2072/12525 title: The generic Hanna Neumann conjecture and post correspondence problem authors: Ciobanu, Laura; Martino, Armando; Ventura, Enric <br>abstract: "Vegeu el resum a l'inici del document del fitxer adjunt." <br> http://hdl.handle.net/2072/12454 title: Convolution inequalities in Lorentz spaces authors: Nursultanov, Erlan; Tikhonov, Sergey Yu. <br>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. <br> http://hdl.handle.net/2072/12453 title: Horospheres in hyperbolic geometry authors: Gallego Gómez, Eduardo; Reventós i Tarrida, Agustí; Solanes Farrés, Gil; Teufel, E. <br>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. <br>