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Tropical Combinatorics

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The Coarse Type Ideal<br />

Definition<br />

Let A = A(V ) be an arrangement on n tropical hyperplanes in<br />

T d−1 . The coarse type ideal of A is the monomial ideal<br />

I t(A) = 〈x t(p) : p ∈ T d−1 〉 ⊂ K[x1, . . .,xd]<br />

where x t(p) = x t(p)1<br />

1 x t(p)2<br />

2 · · ·x t(p)d<br />

d .<br />

similar construction for (oriented) matroids<br />

[Novik, Postnikov & Sturmfels 2002]

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