A configuration of 15 lines and 15 points, with three lines through three points, three points on every line, and containing no triangles. It is illustrated above in two configurations, the left one due to Wells (1991, p. 40) and the right one due to Pisanski et al. (2001).
See alsoConfiguration, Tutte 8-Cage
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ReferencesPisanski, T.; Boben, M.; Marušič, D.; Orbanić, A.; and Graovac, A. "The Generalized Balaban Configurations." Preprint. 2001. http://citeseer.ist.psu.edu/448980.html.Wells, D. The Penguin Dictionary of Curious and Interesting Geometry. London: Penguin, p. 40, 1991.
Cite this as:
Weisstein, Eric W. "Cremona-Richmond Configuration." From MathWorld--A Wolfram Web Resource. https://mathworld.wolfram.com/Cremona-RichmondConfiguration.html