A 1 1/2-dimensional version of Hopf's Theorem on the number of ends of a group.
A band generated by two semilattices is regular.
A basic for the type <n> hyperidentities of the medial variety of semigroups.
A Bers-like proof of the existence of train tracks for free group automorphisms
Using Lipschitz distance on Outer space we give another proof of the train track theorem.
A better proof of the Goldman-Parker conjecture.
A block-theory-free characterization of
A brief review of abelian categorifications.
A Burnside Approach to the Termination of Mohri's Algorithm for Polynomially Ambiguous Min-Plus-Automata
We show that the termination of Mohri's algorithm is decidable for polynomially ambiguous weighted finite automata over the tropical semiring which gives a partial answer to a question by Mohri [29]. The proof relies on an improvement of the notion of the twins property and a Burnside type characterization for the finiteness of the set of states produced by Mohri's algorithm.
A cancellative amenable ascending union of nonamenable semigroups
We construct an example of a cancellative amenable semigroup which is the ascending union of semigroups, none of which are amenable.
A Canonical Filtration for Certain Rational Modules.
A certain equivalence on a semigroup
A certain property of abelian groups
A character approach to Looijenga's invariant theory for generalized root systems
A characterezation of regular duo semigroups
A Characteristic 2-Subgroups of a Finite Special Group.
A characterization of 0-minimal -ideals
A characterization of a class of semigroups.
A characterization of a free elementary semigroup.
A characterization of alternating groups by the set of orders of maximal Abelian subgroups.
A characterization of where
The order of every finite group can be expressed as a product of coprime positive integers such that is a connected component of the prime graph of . The integers are called the order components of . Some non-abelian simple groups are known to be uniquely determined by their order components. As the main result of this paper, we show that the projective symplectic groups where are also uniquely determined by their order components. As corollaries of this result, the validities of a...