Quasi-symmetric designs with block intersection numbers x and y are investigated. Let r be the usual block graph of such a design. Let F be the number of triangles on any edge of r, the complement ofâ€¦ (More)

In a recent paper, Pawale [22] investigated quasi-symmetric 2-(v, k, Î») designs with intersection numbers x > 0 and y = x+ 2 with Î» > 1 and showed that under these conditions either Î» = x + 1 or Î» =â€¦ (More)

A quasi-symmetric design (QSD) is a 2-(v, k, Î») design with intersection numbers x and y with x < y. The block graph of such a design is formed on its blocks with two distinct blocks being adjacentâ€¦ (More)