ndependence of axioms for biordered sets.
New operations on partial Abelian monoids defined by preideals
We consider partial abelian monoids, in particular generalized effect algebras. From the given structures, we construct new ones by introducing a new operation , which is given by restriction of the original partial operation + with respect to a special subset called preideal. We bring some derived properties and characterizations of these new built structures, supporting the results by illustrative examples.
Note on a question of Reinhold Baer on pregroups
Note on a Question of Reinhold Baer on Pregroups II