ScalingStacks

4.6 [035P]

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4.6

For a closed subvariety YY of TT of dimension nn, the tropical variety associated to XX is defined by Trop⁡(Y):=trop⁡(Yan){\rm Trop}(Y):={{\rm trop}}({Y^{\rm an}}). The Bieri–Groves theorem says that Trop⁡(Y){\rm Trop}(Y) is a finite union of nn-dimensional integral Γ\Gamma-affine polyhedra in ℝr{\mathbb{R}}^{r}. It is shown in tropical geometry that Trop⁡(Y){\rm Trop}(Y) is an integral Γ\Gamma-affine polyhedral complex. The polyhedral structure is only determined up to subdivision which does not matter for our constructions. We will see below that the tropical variety is endowed with a positive canonical weight mm satisfying the balancing condition from 3.7. We get a tropical cycle of pure dimension nn which we also denote by Trop⁡(Y){\rm Trop}(Y) forgetting the weight mm in the notation.

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