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The Four Color Theorem
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The Four Color Theorem
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4 colour theorem: an elegant proof?
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4 colour theorem: an elegant proof?
![PDF] A new proof of the four-colour theorem | Semantic Scholar](https://d3i71xaburhd42.cloudfront.net/79a3316d4f67d6a4a0c1267649896b8cf85b0034/6-Figure2-1.png "PDF] A new proof of the four-colour theorem | Semantic Scholar")
PDF] A new proof of the four-colour theorem | Semantic Scholar
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The Four Color Theorem
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PDF) A Victorian Age Proof of the Four Color Theorem
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![PDF] Formal Proof—The Four- Color Theorem | Semantic Scholar](https://d3i71xaburhd42.cloudfront.net/1921899c005c4cf1ee15358377c2f63eb6c99d07/5-Figure1-1.png "PDF] Formal Proof—The Four- Color Theorem | Semantic Scholar")