1 Sperner’s Lemma
1.1
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Given a simplicial complex \(S\), and a a coloring \(f\) on it, we say that \(f\) is a Sperner coloring of \(S\) if \(f(x) \neq i\) if \(x\) belongs to the \(i\)-th face (that with zero \(i\)-th coordinate).
1.2
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A simplicial complex with a Sperner coloring on it, contains a panchromatic simplex.