Example 4.44 . [02QM]
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Example 4.44.
The projective morphisms associated to -Cartier divisors generated by global sections can also be made explicit in terms of the lattice points of the associated polytope. Consider a complete toric variety of dimension equipped with a -Cartier divisor generated by global sections. Let be such that . These vectors determine an H-representation . Let be the linear map defined by . By Lemma 3.79, .
In we consider the fan , whose associated toric variety is . One easily verifies that, for each , there is with . Let be an arbitrary rational point of the principal open subset of . The equivariant morphism can be written explicitly as . Moreover, .