Remark 101.19.3. Let P be a property of algebraic spaces over fields which is invariant under ground field extensions. Given an algebraic stack \mathcal{X} and x \in |\mathcal{X}|, we say the automorphism group of \mathcal{X} at x has P if the equivalent conditions of Lemma 101.19.2 are satisfied. For example, we say the automorphism group of \mathcal{X} at x is finite, if G_ x \to \mathop{\mathrm{Spec}}(k) is finite whenever x : \mathop{\mathrm{Spec}}(k) \to \mathcal{X} is a representative of x. Similarly for smooth, proper, etc. (There is clearly an abuse of language going on here, but we believe it will not cause confusion or imprecision.)
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