I'm collaborating with some algebraic geometers in a paper, and when writing the introduction I mentioned the interaction of Combinatoricscombinatorics and Algebraic Geometryalgebraic geometry, and gave some examples like the Combinatorialcombinatorial Nullstellensatz, the affirmative answer to the conjecture of Read and Rota-Heron-Welsh and the graph-theoretic analogue of the Riemann-Roch theorem, but then, it seems that all these interactions are one way. I would like to know of an important Algebraic Geometry Theoremalgebraic geometry theorem proved using Combinatoricscombinatorics, or at least used combinatorics in a critical part.
Pedro
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