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arxiv: 1607.08780 · v1 · pith:MGSOQFHYnew · submitted 2016-07-29 · 🧮 math.CO

A Generalization of Gale's lemma

classification 🧮 math.CO
keywords generalizationboundsconidgalelemmalowerchromaticcombinatorial
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In this work, we present a generalization of Gale's lemma. Using this generalization, we introduce two combinatorial sharp lower bounds for ${\rm conid}({\rm B}_0(G))+1$ and ${\rm conid}({\rm B}(G))+2$, two famous topological lower bounds for the chromatic number of a graph $G$.

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