Tetrahedral curves via graphs and Alexander duality
Abstract
A tetrahedral curve is a (usually nonreduced) curve in P3 defined by an unmixed, height two ideal generated by monomials. We characterize when these curves are arithmetically Cohen-Macaulay by associating a graph to each curve and, using results from combinatorial commutative algebra and Alexander duality, relating the structure of the complementary graph to the Cohen-Macaulay property.
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