Localizations of tensor categories and fiber products of schemes
Localizations of tensor categories and fiber products of schemes
复制标题
张量类别和方案的纤维积的本地化
DOI:
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发表时间:
2020
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通讯作者:
Martin Brandenburg
中科院分区:
文献类型:
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作者:
Martin Brandenburg
We prove that the tensor category of quasi-coherent modules $mathsf{Qcoh}(X imes_S Y)$ on a fiber product of quasi-compact quasi-separated schemes is the bicategorical pushout of $mathsf{Qcoh}(X)$ and $mathsf{Qcoh}(Y)$ over $mathsf{Qcoh}(S)$ in the $2$-category of cocomplete linear tensor categories. In particular, $mathsf{Qcoh}(X imes Y)$ is the bicategorical coproduct of $mathsf{Qcoh}(X)$ and $mathsf{Qcoh}(Y)$. For this we introduce idals, which can be seen as non-embedded ideals, and use them to study localizations of cocomplete tensor categories in general.