Musings on an example of Danzer’s

doi:10.1016/j.ejc.2008.01.004

European Journal of Combinatorics

Volume 29, Issue 8, November 2008, Pages 1910-1918

Dedicated with best wishes to Ludwig Danzer, a friend for almost half a century, on his eightieth birthday

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Abstract

Some twenty years ago Ludwig Danzer provided the example of a (35₄) geometric configuration for which no visually attractive presentation was found despite its great combinatorial symmetry. For a long time no other (35₄) configurations was known. This changed recently, and the newly found symmetric configurations, and missteps in finding them, are presented in some detail.