Isométrics parfaites entre blocs de groupes linéaires ou unitaires.
Isométries de caractères et équivalences de Morita ou dérivées
Isometries of multilattice groups
Isometries of systolic spaces
We provide a classification of isometries of systolic complexes corresponding to the classification of isometries of CAT(0)-spaces. We prove that any isometry of a systolic complex either fixes the barycentre of some simplex (elliptic case) or stabilizes a thick geodesic (hyperbolic case). This leads to an alternative proof of the fact that finitely generated abelian subgroups of systolic groups are undistorted.
Isometry classes of generalized associahedra.
Isometry groups of non standard metric products
We consider isometry groups of a fairly general class of non standard products of metric spaces. We present sufficient conditions under which the isometry group of a non standard product of metric spaces splits as a permutation group into direct or wreath product of isometry groups of some metric spaces.
Isomorfismi reticolari e prodotti intrecciati
Isomorphe Gruppenringe lokal endlicher Gruppen.
Isomorphic Chevalley groups over integral domains
Isomorphism classes and derived series of certain almost-free groups.
Isomorphism of commutative group algebras of -mixed splitting groups over rings of characteristic zero
Suppose is a -mixed splitting abelian group and is a commutative unitary ring of zero characteristic such that the prime number satisfies . Then and are canonically isomorphic -group algebras for any group precisely when and are isomorphic groups. This statement strengthens results due to W. May published in J. Algebra (1976) and to W. Ullery published in Commun. Algebra (1986), Rocky Mt. J. Math. (1992) and Comment. Math. Univ. Carol. (1995).
Isomorphism of Commutative Modular Group Algebras
∗ The work was supported by the National Fund “Scientific researches” and by the Ministry of Education and Science in Bulgaria under contract MM 70/91.Let K be a field of characteristic p > 0 and let G be a direct sum of cyclic groups, such that its torsion part is a p-group. If there exists a K-isomorphism KH ∼= KG for some group H, then it is shown that H ∼= G. Let G be a direct sum of cyclic groups, a divisible group or a simply presented torsion abelian group. Then KH ∼= KG as K-algebras...
Isomorphism of Modular Group Algebras.
Isomorphism of modular group algebras of direct sums of torsion-complete abelian -groups
Isomorphism of noncommutative group algebras of torsion-free groups over a field.
Isomorphism of projective planes and isotopism of planar ternary rings
Isomorphism theorems of polygroups.
Isomorphisms and automorphisms of integral group rings
Isomorphisms in the Farrell cohomology of .
Isomorphisms of Cayley graphs of a free Abelian group.