Remark 59.4.2. In the last statement, it is essential not to forget the case where i = j which is in general a highly nontrivial condition (unlike in the Zariski topology). In fact, frequently important coverings have only one element.
Remark 59.4.2. In the last statement, it is essential not to forget the case where i = j which is in general a highly nontrivial condition (unlike in the Zariski topology). In fact, frequently important coverings have only one element.
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