On automorphisms of semitriangular graphs with \(\mu = 7\) (Q656373)

The authors consider automorphisms of semitriangular graphs with \(\mu =7\). Graphs are strongly regular graphs with parameters \((v,k,\lambda,\mu)\) if \(v\) is their number of vertices, they are regular graphs of degree \(k\), each of their edges lies in exactly \(\lambda\) triangles and for any two vertices \(a\) and \(b\), \(\mu(a,b)\) is \(\left|\left[a\right] \cap \left[b\right]\right|\), where \(\left[a\right]\) and \(\left[b\right]\) denote the neighborhoods of two nonadjacent vertices \(a\) and \(b\). For strong regular graphs \(\mu (a,b)\) does not depend \(a\) and \(b\). The authors find possible automorphisms of semitriangular graph with \(\mu =7\) and subgraphs of their fixed points.