A Steiner system is a set of points, and a collection of subsets of of size (called blocks), such that any points of are in exactly one of the blocks. The special case and corresponds to a so-called Steiner Triple System. For a Projective Plane, , , , and the blocks are simply lines.

**References**

Colbourn, C. J. and Dinitz, J. H. (Eds.) *CRC Handbook of Combinatorial Designs.*
Boca Raton, FL: CRC Press, 1996.

Woolhouse, W. S. B. ``Prize Question 1733.'' *Lady's and Gentleman's Diary.* 1844.

© 1996-9

1999-05-26