Publications [#236022] of Robert Calderbank

Journal articles or Book chapters PUBLISHED

1. Calderbank, AR, Inequalities for quasi-symmetric designs, Journal of Combinatorial Theory Series A, vol. 48 no. 1 (January, 1988), pp. 53-64, Elsevier BV, ISSN 0097-3165 [doi]
   (last updated on 2026/01/17)

   Abstract:
   A 2-design is said to be quasi-symmetric if there are two block intersection sizes. We obtain inequalities satisfied by the parameters of a quasi-symmetric design using linear programming techniques. The same methods apply to codes with covering radius 2 with the property that the number of codewords at distance 2 from a given vector ν depends on the distance of ν from the code. © 1988.