نحن نجمع طرقاً كلاسيكية من نظرية المجموعات المركبة مع نظرية الإلغاء الصغير على المجموعات المتضاءلة الهيبروليكية لإنشاء مجموعات مولدة محدوداً خالية من التثبيط، والتي تحتوي فقط على عدد محدود من الصنف من العناصر المتشابهة. بالإضافة إلى ذلك، نقدم عدة نتائج تتعلق بالتضمين في هذه المجموعات. كتطبيق آخر لهذه التقنيات، نثبت أن كل مجموعة قابلة للعد تستطيع أن تتحقق كمجموعة من الخارجيات لمجموعة $N$، حيث أن $N$ هي مجموعة مولدة محدوداً تتمتع بخاصية كازدان (T) وتحتوي على مجموعتين من الصنف من العناصر المتشابهة.
We combine classical methods of combinatorial group theory with the theory of small cancellations over relatively hyperbolic groups to construct finitely generated torsion-free groups that have only finitely many classes of conjugate elements. Moreover, we present several results concerning embeddings into such groups. As another application of these techniques, we prove that every countable group $C$ can be realized as a group of outer automorphisms of a group $N$, where $N$ is a finitely generated group having Kazhdans property (T) and containing exactly two conjugacy classes.
The twin group $T_n$ is a right angled Coxeter group generated by $n-1$ involutions and the pure twin group $PT_n$ is the kernel of the natural surjection from $T_n$ onto the symmetric group on $n$ symbols. In this paper, we investigate some structur
All finite simple groups are determined with the property that every Galois orbit on conjugacy classes has size at most 4. From this we list all finite simple groups $G$ for which the normalized group of central units of the integral group ring ZG is an infinite cyclic group.
We construct a finitely presented group with infinitely many non-homeomorphic asymptotic cones. We also show that the existence of cut points in asymptotic cones of finitely presented groups does, in general, depend on the choice of scaling constants and ultrafilters.
We study conjugacy classes of solutions to systems of equations and inequations over torsion-free hyperbolic groups, and describe an algorithm to recognize whether or not there are finitely many conjugacy classes of solutions to such a system. The cl
In this paper we classify the finite groups satisfying the following property $P_4$: their orders of representatives are set-wise relatively prime for any 4 distinct non-central conjugacy classes.