Block Designs with SDP Parameters

[摘要] It is traditional to call a quasi-symmetric design with certain parameters an SDP design if the symmetric difference of two different blocks is either a block or a block complement. In this note, we delete the requirements on the parameters and demand jus

[学科分类] 离散数学和组合数学

[关键词] SDP designs;quasi-symmetric designs;parameters;Hadamard designs