The down-up journey of the quadruple impossible staircase [Le voyage descendant-ascendant de l'escalier quadruplement impossible].




See the quadruple impossible staircase:




(CMAP28 WWW site: this page was created on 07/16/2019 and last updated on 07/25/2019 16:35:57 -CEST-)



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Copyright (c) Jean-François Colonna, 2019.
Copyright (c) CMAP (Centre de Mathématiques APpliquées) UMR CNRS 7641 / Ecole Polytechnique, 2019.