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Artin's axioms, composition and moduli spaces

Jason Michael Starr

math.AGarXiv:math/0602646

Abstract

We prove Artin's axioms satisfy a compatibility for composition of 1-morphisms of stacks in groupoids. Consequently, some natural stacks in groupoids are algebraic, including a common generalization of Vistoli's Hilbert stack and the stack of branchvarieties of Alexeev and Knutson.

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