Stacks in one sentence

Posted on July 6, 2016 by arithmetica

A stack is just some rule which specifies a category of “wumbles over X” for every object X in some given site, with the property that both morphisms of wumbles and wumbles themselves can be specified locally on coverings in the site.

Bonus: Drop “and wumbles themselves”, and you get a prestack instead.

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