balanced incomplete block design | BIBD

An incidence system (v, k, λ, r, b) in which a set X of v points is partitioned into a family A of b subsets (blocks) in such a way that any two points determine λ blocks with k points in each block, and each point is contained in r different blocks. It is also generally required that k

affine plane | design | Fano plane | Hadamard design | parallel class | projective plane | resolution | resolvable | Steiner triple system | symmetric block design | unital