Results 51 to 60 of about 209 (119)

Automorphic Bloch theorems for hyperbolic lattices. [PDF]

open access: yesProc Natl Acad Sci U S A, 2022
Maciejko J, Rayan S.
europepmc   +1 more source

Products of Free Groups in the Unit Group of Integral Group Rings II

open access: yes, 1997
We classify all the finite groupsG, such that the group of units ofZGcontains a subgroup of finite index which is isomorphic to a direct product of nonabelian free groups.
del Rı́o, Angel, Leal, Guilherme
core   +1 more source

The SQ universality of some small cancellation groups

open access: yes, 1977
PhDA group G is a small cancellation group if, roughly, it has a presentation G=
Al-Janabi, Mohammed Abdul-Razzak
core  

On free groups in the unit group of integral group rings

open access: yes, 1996
We present a short history of the following problem: Classify the finite groups G, so that the group of units of the integral group ring Z G contains a subgroup of finite index isomorphic to a direct product of nonabelian free ...
Del Río, Angel
core   +1 more source

Harmonic maps, SU (N) skyrme models and yang-mills theories [PDF]

open access: yes, 2002
This thesis examines the construction of static solutions of (3+l)-dimensional SU{N) Skyrme models, usual and alternative, and pure massive SU(N) Yang-Mills theories.
Wospakrik, Hans Jacobus
core  

Van Kampen’s embedding obstruction for discrete groups [PDF]

open access: yes, 2002
We give a lower bound to the dimension of a contractible manifold on which a given group can act properly discontinuously. In particular, we show that the n -fold product of nonabelian free groups cannot act properly discontinuously on ℝ 2 n −1 .Peer ...
Kleiner, Bruce   +2 more
core   +1 more source

Classification of free actions on complete intersections of four quadrics [PDF]

open access: yes, 2011
In this paper we classify all free actions of finite groups on Calabi-Yau complete intersection of four quadrics in ℙ 7, up to projective equivalence. We get some examples of smooth Calabi-Yau three-folds with large nonabelian fundamental groups. We also
Hua, Z
core   +1 more source

Translation lengths of outer automorphisms of finitely generated free-by-finite groups

open access: yes, 2022
Bestvina, Feighn and Handel proved that every subgroup of the outer automorphism group, (Formula presented.) of the free group of rank n is either virtually finitely generated abelian or contains a nonabelian free group. In this note we consider the more
Sykiotis, M., Papavasileiou, I.
core  

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