Angular 2-structures (Q1184995)

This paper deals with angular 2-structures where a 2-structure is an ordered pair \((D,R)\) such that \(D\) is a nonempty finite set and \(R\) is an equivalence relation on \(E_ 2(D)=D\times D-\{(x,x)\mid x\in D\}\). The two authors develop both a basis theory of angular 2-structures and a short course on so-called primitive angular 2-structures. Finally, they show the relationship between an angular 2-structure and a symmetric graph and a partial order.