Definition 66.16.2. Let $S$ be a scheme. A morphism $f : X \to Y$ between algebraic spaces over $S$ is called *étale* if and only if for every étale morphism $\varphi : U \to X$ where $U$ is a scheme, the composition $f \circ \varphi $ is étale also.

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## Comments (2)

Comment #2317 by Nithi Rungtanapirom on

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