A simple proof of Vinogradov’s theorem on the orderability of the free product of -groups
A simplification of D'Alarcao's idempotent separating extensions of inverse semigroups.
A Single Groupoid Identity for Steiner Loops
A sketch of the lattice of commutative nilpotent semigroup varieties.
A solvability criterion for finite groups related to character degrees
Let be a fixed positive integer. In this paper, we consider finite groups each of whose nonlinear character degrees has exactly prime divisors. We show that such groups are solvable whenever . Moreover, we prove that if is a non-solvable group with this property, then and is an extension of or by a solvable group.
A Specht module analog for the rook monoid.
A special congruence lattice of a regular semigroup.
A Specialization Theorem for Certain Weyl Group Representations and an Application to the Green Polynomials of Unitary Groups.
A spelling theorem for staggered generalized 2-complexes, with applications.
A split exact sequence of Mackey functors.
A splitting criterion for Abelian groups
A splitting principle for group representations.
A splitting theorem for linear polycyclic groups.
A stability property for coefficients in Kronecker products of complex characters.
A Stiefel complex for the orthogonal group of a field.
A Strengthened Freiheitssatz.
A structure theorem for 2-hypergroupoids with topological applications.
A structure theorem for KT-nearfields.
A structure theorem for right invariant right holoids.
A structure theorem for right pp-semigroups with left central idempotents
The concept of strong spined product of semigroups is introduced. We first show that a semigroup S is a rpp-semigroup with left central idempotents if and only if S is a strong semilattice of left cancellative right stripes. Then, we show that such kind of semigroups can be described by the strong spined product of a C-rpp-semigroup and a right normal band. In particular, we show that a semigroup is a rpp-semigroup with left central idempotents if and only if it is a right bin.