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Conferencia por Dessislava Kochlouk UNICAMP, Campinhas, Brasil título “Volume gradients and homology in towers of residually-free groups” Abstract: I will present the results from the joint work with Martin Bridson, arXiv:1309.1877. One of the main results is the calculation of the l2-Betti numbers in dimension \leq m-1 of all residually free groups of type FPm, using Luck's aproximation theorem. If the time permits I will discuss some new corollaries of the techniques introduced in the above preprint. Fecha: Hora: Lugar: Viernes, 10 de abril de 2015 12:00 horas Seminario de Álgebra, Edificio de Matemáticas, 2ª planta _________________________________________________________________________________________________________ IUMA- Universidad de Zaragoza - Edificio de Matemáticas, Planta 1ª, Pedro Cerbuna, 12, 50009 Zaragoza – Spain Tel.: +34 976762688 http://iuma.unizar.es e-mail: [email protected]