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Tropical Fano Schemes

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arxiv 1807.06283 v2 pith:MJXWL7N2 submitted 2018-07-17 math.AG

Tropical Fano Schemes

classification math.AG
keywords tropfanosubseteqtropicalvarietycomplexconstructcontained
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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We define a tropical version $\F_d(\trop X)$ of the Fano Scheme $\F_d(X)$ of a projective variety $X\subseteq \mathbb P^n$ and prove that $\F_d(\trop X)$ is the support of a polyhedral complex contained in $\trop \Grp(d,n)$. In general $\trop \F_d(X)\subseteq \F_d(\trop X)$ but we construct linear spaces $L$ such that $\trop \F_1(X)\subsetneq \F_1(\trop X)$ and show that for a toric variety $\trop \F_d(X)=\F_d(\trop X)$.

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