Biplanes (56, 11, 2) with involutory collineation fixing 6 points
In this paper under review, a complete classification of biplanes (56,11,2) admitting an involutory collineation that fixes six points is given. More specifically, it is shown that each of these biplanes is up to isomorphism one of the following: Hall's biplane \(B_{20}\), Salwach and Mezzaroba's biplane \(B_{22}\), Denniston's biplane \(B_{24}\), or the biplane described by \textit{Z. Janko} and \textit{Tran Van Trung} in J. Comb. Theory, Ser. A 42, 305-309 (1986; Zbl 0656.05019).
scientific article; zbMATH DE number 4162892