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Finiteness of open substacks with proper moduli spaces

Xucheng Zhang

Source record

Source: arXiv

Published: Oct 12, 2026

arXiv: 2610.16706

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Source abstract

For an algebraic stack of finite type, we construct a finite stratification of an atlas such that every universally closed open substack pulls back to a union of strata. As a result, there are only finitely many open substacks admitting a proper adequate moduli space.

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Finiteness of open substacks with proper moduli spaces — Mathematical Frontier Network