Grünbaum-Rigby_configuration.jpg (275 × 275 pixels, file size: 32 KB, MIME type: image/jpeg)
This image appeared on Wikipedia's Main Page in the Did you know? column on 20 May 2019 (see archives). |
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current | 14:11, 18 May 2019 | 275 × 275 (32 KB) | David Levy | {{Information |description = {{en|The first known geometric 4-configuration, established by Grünbaum and Rigby in 1990}} |date = 2019-04-14 |source = {{derived from|Grun rig.pdf}} |author = Tomo |permission = {{cc-by-sa-4.0}} {{GFDL|migration=redundant}} }} Category:Heptagrams Category:Incidence geometry |