Combinatorics MOC Steiner system An Steiner system is a set of points, together with a set of -element subsets , called blocks or -ads, such that any set of points is contained in exactly one -ad. comb Excluding trivial systems, . A finite projective plane of order is an . In particular the Fano plane is the unique [[Fano plane|]] Steiner system. Special Steiner systems [[Fano plane|]] S(5,8,24) develop | en | sembr