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| Paper IPM / M / 15374 | ||||||||||||||||||
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In this work, we present a generalization of Gale's lemma. Using this generalization, we introduce two sharp combinatorial lower bounds for coind(B_0(ðº))+1 and coind(B(ðº)) + 2, the two classic topological lower bounds for the chromatic number of a graph ðº.
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