A 
block design (abbreviated 
-design) is an incidence structure of points and blocks such that the following hold:
1. There are 
points,
2. Each block contains 
points,
3. For any 
points there are exactly 
blocks that contain all these points.
See also
Block Design,
Configuration,
Steiner System This entry contributed by Jordan Bell
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References
Colbourn, C. J. and Dinitz, J. H. (Eds.). CRC Handbook of Combinatorial Designs. Boca Raton, FL: CRC Press, pp. 47-66, 1996.Referenced on Wolfram|Alpha
t-Design Cite this as:
Bell, Jordan. "t-Design." From MathWorld--A Wolfram Resource, created by Eric W. Weisstein. https://mathworld.wolfram.com/t-Design.html
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