While reading about computer-assisted proof in Mathematics ( a huge subject),
I came across the four color problem and all the work done around it. Let me
join the myriad other innocents who feel it should be a straightforward affair with
a proof on the following visuals.
Two Colors: Each piece needs another boundary color.
Three Color: The purple rectangle needs two others.
Four Color: Two of the purple rectangles need three others.
We are on a two-dimensional plane; that's it.
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