The design of the century

Forbes, Anthony; Grannell, Mike and Griggs, Terry (2007). The design of the century. Mathematica Slovaca, 57(5) pp. 495–499.

DOI: https://doi.org/10.2478/s12175-007-0041-4

Abstract

We construct a 2-chromatic Steiner system $S(2,4,100)$ in which every block contains three points of one colour and one point of the other colour. The existence of such a design has been open for over 25 years.

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