On the homeotopy group of the non orientable surface of genus three.
On the Homology and Cohomology of Congruence Subgroups.
On the homology of Lie groups made discrete.
On the homology of the special linear group ove a number field.
On the Homology Theory of Central Group Extensions: I - The Commutator Map and Stem Extensions
On the Homology Theory of Central Group Extensions II. The Exact Sequence in the General Case
On the Homomorphisms of the Integral Linear Groups.
On the homotopy groups of some equivariant automorphism groups of spheres
On the hypergroups with four proper pairs and without scalars
On the ideal triangulation graph of a punctured surface
We study the ideal triangulation graph of an oriented punctured surface of finite type. We show that if is not the sphere with at most three punctures or the torus with one puncture, then the natural map from the extended mapping class group of into the simplicial automorphism group of is an isomorphism. We also show that the graph of such a surface , equipped with its natural simplicial metric is not Gromov hyperbolic. We also show that if the triangulation graph of two oriented punctured...
On the ideals of the semigroup of the 1-sphere
On the idempotent ranks of certain semigroups of order-preserving transformations.
On the index of length four minimal zero-sum sequences
Let G be a finite cyclic group. Every sequence S over G can be written in the form where g ∈ G and , and the index ind(S) is defined to be the minimum of over all possible g ∈ G such that ⟨g⟩ = G. A conjecture says that every minimal zero-sum sequence of length 4 over a finite cyclic group G with gcd(|G|,6) = 1 has index 1. This conjecture was confirmed recently for the case when |G| is a product of at most two prime powers. However, the general case is still open. In this paper, we make some...
On the index of sequences over cyclic groups
On the influence of the indices of normalizers of Sylow subgroups on the structure of a finite -soluble group.
On the integration theorem for Lie groupoids
On the intersection graph of a commutative distributive groupoid
On the intersection graph of a finite group
For a finite group , the intersection graph of which is denoted by is an undirected graph such that its vertices are all nontrivial proper subgroups of and two distinct vertices and are adjacent when . In this paper we classify all finite groups whose intersection graphs are regular. Also, we find some results on the intersection graphs of simple groups and finally we study the structure of .
On the intersection of finitely generated subgroups of free groups.
On the intersection of maximal non-supersoluble subgroups in a finite group
Gli autori studiano il sottogruppo intersezione dei sottogruppi massimali e non supersolubili di un gruppo finito e le relazioni tra la struttura di e quella di .