Gaglione, A.M.; Lipschutz, S.; Spellman, D.
(Algebra and Discrete Mathematics, 2012)
There has been recent interest in Stallings’ Pregroups. (See [2] and [12].) This paper gives a survey of generalized pregroups. We also answer a question of Reinhold Baer [1] on pregroups and answer a generalization of ...