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# Barcelona Algebraic Topology Group

Barcelona Algebraic Topology Group
 2014 Barcelona Topology Workshop
 The Barcelona Topology Workshop is the annual meeting of the Grup de Topologia Algebraica de Barcelona. The Barcelona Topology Workshop 2014 (BaToWo'14) will take place on the 24-25th October, at the Torre Vila-Puig in the UAB . Researchers in Algebraic Topology and related topics are encouraged to attend the meeting and participate in the discussions about the actual development of the subject and future prospects. As it is already usual in these meetings the discussions will be motivated by a small number of plenary lectures. Nils Baas (Norwegian University of Science and Technology, Trondheim) Alberto Gavira-Romero (Málaga) Gerd Laures (Ruhr Universität, Bochum) Julien Marché (Institut de Mathématiques de Jussieu) Vicente Muñoz (Universidad Complutense de Madrid, Instituto de Ciencias Matemáticas (CSIC-UAM-UC3M-UCM)) Thomas Nikolaus (Universität Regensburg) Vesna Stojanoska (Max Planck Institute for Mathematics, Bonn) Alain Valette (Université de Neuchâtel) More information on the web page http://mat.uab.cat/~btw.

 Friday's Topology Seminar 2014-2015
 Date and place: October 10, 2014. 12:00. CRM, small lecture room. Speaker : Nguyen The Cuong Title: On  the algebraic EHP sequence Abstract: One of the most basic problems in homological algebra is to construct explicit injective (projective) resolutions of modules. We are interested in finding such constructionfor the reduced co-homology $\tilde{H}^*(S^n; \mathbb F_2)$ of the spheres $S^n$ in the category of unstable modules U. The pseudo-hyper resolution is developed as an attempt to deal with this problem. The question is at present far from being solved but we manage somehow to archive some interesting properties of minimal injective resolutionsof $\tilde{H}^*(S^n; \mathbb F_2)$ in U. These results provide a new point of view for the problem of computing the E2 page of the unstable Adams spectral sequence converging to homotopy groups of spheres. One of the first applications of these computations, which is also the main goal of this talk, is an elementary reconstruction of the algebraic EHP sequence and an approximation to the sphere of origin question. Read more...

 Presentation