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The square of opposition: Four colours sufficient for the “map” of logic

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posted on 2016-10-18, 18:24 authored by Васил ПенчевВасил Пенчев
From the “four-colours theorem” to the “four-letters theorem”

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    square of oppositionfour-colours theoremMathematical Logic, Set Theory, Lattices and Universal AlgebraTopology

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