Perfect Baer Subplane Partitions and Three-Dimensional Flag-Transitive Planes

A three-class association scheme on the

A three-class association scheme on the flags of a finite projective plane and a (PBIB) design defined by the incidence of the flags and the Baer subplanes in PG(2, q2)

✍ I.M. Chakravarti 📂 Article 📅 1993 🏛 Elsevier Science 🌐 English ⚖ 262 KB

First we define relations between the u = (s\* + s + 1) (s + 1) flags (point-line incident pairs) of a finite projective plane of order s. Two flags a E (p, 1) and b = (p', l'), where p and p' are two points and 1 and 1' are two lines of the projective plane, are defined to