4.6 [035P]
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4.6
For a closed subvariety of of dimension , the tropical variety associated to is defined by . The Bieri–Groves theorem says that is a finite union of -dimensional integral -affine polyhedra in . It is shown in tropical geometry that is an integral -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 satisfying the balancing condition from 3.7. We get a tropical cycle of pure dimension which we also denote by forgetting the weight in the notation.