Inequalities and bounds for quasi-symmetric 3-designs
The author establishes several inequalities that are satisfied by the parameters of a quasi-symmetric 3-design having block intersection numbers \(x\), \(y\) where \(1\leq x<y\). Some of these results are then used to determine all such designs with \(y=x+1\) or \(x+2\).
scientific article; zbMATH DE number 64856
scientific article