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Problems related to graph drawing such as crossing numbers, layout designs, and intersection graphs.

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Concrete works by Alexandre Grothendieck, other than Dessin d'Enfants?

For me "Dessin d'Enfants" by Alexandre Grothendieck is the more concrete research work he has done. I would like to know if there are others. When he was teaching at Montpellier University (during the …
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