Quasi-symmetric designs with the difference of block intersection numbers two

Authors:
Rajendra M. Pawale
Affiliations:
Department of Mathematics, University of Mumbai, Vidyanagari, Mumbai, India 400 098
Venue:
Designs, Codes and Cryptography
Year:
2011

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Abstract

Quasi-symmetric designs with intersection numbers x 0 and y = x + 2 under the condition 驴 1 are investigated. If D(v, b, r, k, 驴; x, y) is a quasi-symmetric design with above conditions then it is shown that either 驴 = x + 1 or x + 2 or D is a design with the parameters given in the Table 6 or complement of one of these designs.