ScalingStacks

Example 4.26 . [02Q2]

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Example 4.26.

We continue with the notation of examples 3.76 and 4.3. The fan ΣΔn\Sigma_{\Delta^{n}} has n+1n+1 rays. For each i=0,…,ni=0,\dots,n, the closure of the orbit corresponding to the ray generated by the vector eie_{i} is the standard hyperplane of ℙn\mathbb{P}^{n}

Hi:=V(⟨ei⟩)={(p0:…:pn)∈ℙn∣pi=0}.H_{i}:=V(\langle e_{i}\rangle)=\{(p_{0}:\dots:p_{n})\in\mathbb{P}^{n}\mid p_{i}=0\}.

The function ΨΔn\Psi_{\Delta^{n}} is a support function on ΣΔn\Sigma_{\Delta^{n}} and the 𝕋\mathbb{T}-Weil divisor associated to DΨΔnD_{\Psi_{\Delta^{n}}} is [DΨΔn]=H0[D_{\Psi_{\Delta^{n}}}]=H_{0}.

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