On central extensions of mapping class groups.
On central nilpotency in finite loops with nilpotent inner mapping groups
In this paper we consider finite loops whose inner mapping groups are nilpotent. We first consider the case where the inner mapping group of a loop is the direct product of a dihedral group of order and an abelian group. Our second result deals with the case where is a -loop and is a nilpotent group whose nonabelian Sylow subgroups satisfy a special condition. In both cases it turns out that is centrally nilpotent.
On centralizers of elements of groups acting on trees with inversions.
On centralizers of involutions having a component of type and
On centrally nilpotent loops
Using a lemma on subnormal subgroups, the problem of nilpotency of multiplication groups and inner permutation groups of centrally nilpotent loops is discussed.
On centroids of generalized regular rings
On certain algebraic groups attached to local number-fields.
On certain characterizations of barely transitive groups
On Certain Classes of rigid groups
On Certain Classical Groups over Hasse Domains.
On certain closed subgroups of .
On certain codes admitting inverse semigroups as syntactic monoids.
On certain finitely based varieties of semigroups.
On certain homotopy actions of general linear groups on iterated products
The -fold product of an arbitrary space usually supports only the obvious permutation action of the symmetric group . However, if is a -complete, homotopy associative, homotopy commutative -space one can define a homotopy action of on . In various cases, e.g. if multiplication by is null homotopic then we get a homotopy action of for some . After one suspension this allows one to split using idempotents of which can be lifted to . In fact all of this is possible if is an -space...
On certain ideals of the group ring
On certain lattice-ordered semigroups.
On Certain Maximal Subgroups of Symmetric or Alternating Groups.
On Certain Permuation Representations of Mapping Class Groups.
On Certain Representations of Semi-Simple Algebraic Groups and the Arithmetic of the Corresponding Invariants.
On certain subsocles of a primary abelian group