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The Number of Tropical Order Types and Coherent Matching Fields

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We investigate counting problems for discrete (geometric) structures in tropical settings, motivated by the comparison of the expressivity of linear programs and mean-payoff games. First, we give an upper bound on the number of coherent matching fields of type $(n,r)$ and a lower bound on the number of combinatorial types of $n$-hyperplane sequences in the max-plus tropical space of dimension $r-1$. These structures are closely related, and our bounds establish that as $n \to \infty$, for every fixed $r$ their number equals $n^{(r-1)^2n+o(n)}$. This in turn implies that the number of regular triangulations of the products of simplices $Δ^{n-1}\timesΔ^{r-1}$ is also $n^{(r-1)^2n+o(n)}$, thereby answering a question of Santos. Second, we obtain that the number of labeled order types over the reals and over the signed tropical numbers coincide at first order, establishing a comparison of the expressivity of mean-payoff games and linear programs as measured by labeled order types. Last, the subclass of mean-payoff games known as parity games arise from linear programs by a ``double tropicalization.'' We show that the number of labeled order types obtained after this double tropicalization collapses.

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