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Profinite completions of orientable Poincare duality groups of dimension four and Euler characteristic zero
(European Mathematical SocZurichSuíça, 2009)
Presentations of the first homotopy groups of the unitary groups
(Birkhauser Verlag AgBaselSuíça, 2003)
Entertainment recommender systems for group of users
(Pergamon-Elsevier Science Ltd, 2011-10)
Recommender systems are used to recommend potentially interesting items to users in different domains. Nowadays, there is a wide range of domains in which there is a need to offer recommendations to group of users instead ...
On automorphisms of finite abelian p-groups
(VERSITA, 2008)
Let A be a finitely generated abelian group. We describe the automorphism group Aut(A) using the rank of A and its torsion part p-part A(p). For a finite abelian p-group A of type (k(1),..., k(n)), simple necessary and ...
Group identities on symmetric units
(ACADEMIC PRESS INC ELSEVIER SCIENCE, 2009)
Let F be an infinite field of characteristic different from 2, G a group and * an involution of G extended by linearity to an involution of the group algebra FG. Here we completely characterize the torsion groups G for ...
TeX -Groups with few conjugacy classes of normalizers
(2013)
For a group G , denote by ω(G) the number of conjugacy classes of normalizers of subgroups of G . Clearly, ω(G)=1 if and only if G is a Dedekind group. Hence if G is a 2-group, then G is nilpotent of class ≤2 and if G is ...
The fundamental group of the p-subgroup complex
(Oxford University Press, 2020-09)
We study the fundamental group of the p-subgroup complex of a finite group G. We show first that pi1(A_3(Alt_{10})) is not a free group (here Alt_{10} is the alternating group on 10 letters). This is the first concrete ...
BASS CYCLIC UNITS AS FACTORS IN A FREE GROUP IN INTEGRAL GROUP RING UNITS
(WORLD SCIENTIFIC PUBL CO PTE LTD, 2011)
Marciniak and Sehgal showed that if u is a non-trivial bicyclic unit of an integral group ring then there is a bicyclic unit v such that u and v generate a non-abelian free group. A similar result does not hold for Bass ...
Comparing galaxy populations in compact and loose groups of galaxies: II. Brightest group galaxies
(EDP Sciences, 2013-08)
Aims: The properties of the brightest galaxies (BCGs) are studied in both compact and loose groups of galaxies in order to better understand the physical mechanisms influencing galaxy evolution in different environments. ...