On hypercentral subgroups of infinite groups
On hypersurface quotient singularities of dimension 4.
On ideal extensions of completely simple semigroups.
On ideals in regular ternary semigroups
In this paper we study some interesting properties of regular ternary semigroups, completely regular ternary semigroups, intra-regular ternary semigroups and characterize them by using various ideals of ternary semigroups.
On ideals of a semilattice
On ideals of implicative semigroups.
On idempotent semifields and a paper by H. Hutchins.
On imprimitive groups with small degree
On Incidence Structures in Finite Classical Groups.
On indecomposable projective representations of finite groups over fields of characteristic p > 0
Let G be a finite group, F a field of characteristic p with p||G|, and the twisted group algebra of the group G and the field F with a 2-cocycle λ ∈ Z²(G,F*). We give necessary and sufficient conditions for to be of finite representation type. We also introduce the concept of projective F-representation type for the group G (finite, infinite, mixed) and we exhibit finite groups of each type.
On index preserving projectivities of finite groups
On induced morphism of Mislin genera.
Let N be a nilpotent group with torsion subgroup TN, and let α: TN → T' be a surjective homomorphism such that kerα is normal in N. Then α determines a nilpotent group Ñ such that TÑ = T' and a function α* from the Mislin genus of N to that of Ñ in N (and hence Ñ) is finitely generated. The association α → α* satisfies the usual functiorial conditions. Moreover [N,N] is finite if and only if [Ñ,Ñ] is finite and α* is then a homomorphism of abelian groups. If Ñ belongs to the special class studied...
On inert subgroups of a group
On infinitary finite length codes
On infinitary quasigroups.
On infinite Nielsen transformations.
On infinite partition representations and their finite quotients
On infinite tournaments with regular automorphism groups.
On injective and flat commutative regular semigroups.
On Integral Groups. I. The Reducible Case.