MAKE A MEME View Large Image 4ct-non-counterexample.png 4CT_Non-Counterexample_1 svg It is necessary to change the colour of at least four of the ten regions of this map to obtain a proper four-colouring copied from en Image 4ct-non-counterexample png Four-color ...
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Keywords: 4ct-non-counterexample.png 4CT_Non-Counterexample_1 svg It is necessary to change the colour of at least four of the ten regions of this map to obtain a proper four-colouring copied from en Image 4ct-non-counterexample png Four-color theorem
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