请问这个四色猜想的证明,错误之处在什么地方? 知乎 Template




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Try and sketch some of theseBerries, Hags, Chainmail, Track, Highway, Man, Canopy, Stilts, Moose, Gumball machine, view more ideas


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tomski请问这个四色猜想的证明,错误之处在什么地方? 知乎 coloring