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Reformulating the Map Color Theorem

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arxiv math/0112266 v2 pith:YCTUUJ7B submitted 2001-12-23 math.CO

classification math.CO
keywords colorsdiscussionreformulationsspencer-brownthreealgorithmcolorcoloring
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This paper discusses reformulations of the problem of coloring plane maps with four colors. The context is the edge-coloring with three colors of cubic graphs such that three distinct colors occur at each vertex. We include discussion of the Eliahou-Kryuchkov conjecture, the Penrose formula, the vector cross product formulation and the reformulations in terms of formations and factorizations due to G. Spencer-Brown. The latter includes a proof of the Spencer-Brown parity lemma and discussion of the parity-pass algorithm.

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  1. A counterexample for the polar conjecture of Spencer-Brown

    math.CO 2026-07 conditional novelty 7.0 of 10

    A plane graph with a non-polar pentagonal face makes Spencer-Brown's parity pass return to its initial coloring after 60 steps, disproving his Polar Conjecture.

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