this post was submitted on 28 Jul 2023
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How a Doodler's Problem Sparked a Controversy in Math | Scientific American (www.scientificamerican.com)
submitted 1 year ago by troyunrau@lemmy.ca to c/math@lemmy.world
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Four colour problem

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[–] troyunrau@lemmy.ca 3 points 1 year ago

Alright, non Euclidean maps it is then!