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10 papers · 1 filter
Partial and unified crossed products are weak crossed products
J. M. Fernández Vilaboa, R. González Rodríguez, A. B. Rodríguez Raposo
In [J.M. Fernández Vilaboa, R. González Rodríguez and A.B. Rodríguez Raposo: Preunits and weak crossed products. J. of Pure Appl. Algebra 213, 2244-2261 (2009)] the notion of a wea…
Equivalence between the Osserman condition and the Rakić duality principle in dimension four
Miguel Brozos-Vázquez, Eugenio Merino
We show that 4-dimensional Riemannian manifolds which satisfy the Rakić duality principle are Osserman (i.e. the eigenvalues of the Jacobi operator are constant), thus both conditi…
Inductive LS cocategory and localisation
Cristina Costoya, Antonio Viruel
In this paper we prove that the inductive cocategory of a nilpotent -complex of finite type , $\indcocat X$, is bounded above by an expression involving the inductive cocate…
Locally Conformally Flat Lorentzian Gradient Ricci Solitons
M. Brozos-Vázquez, E. García-Río, S. Gavino-Fernández
It is shown that locally conformally flat Lorentzian gradient Ricci solitons are locally isometric to a Robertson-Walker warped product, if the gradient of the potential function i…
Every finite group is the group of self homotopy equivalences of an elliptic space
C. Costoya, A. Viruel
In this paper we prove that every finite group can be realized as the group of self-homotopy equivalences of infinitely many elliptic spaces . Moreover, can be chosen to…
Compressed k2-Triples for Full-In-Memory RDF Engines
Sandra Álvarez-García, Nieves R. Brisaboa, Javier D. Fernández +1
Current "data deluge" has flooded the Web of Data with very large RDF datasets. They are hosted and queried through SPARQL endpoints which act as nodes of a semantic net built on t…