Lemma 73.8.9. Let $S$ be a scheme. Given morphisms $f : X \to Y$, $g : Y \to Z$ of algebraic spaces over $S$ we have $g_{big} \circ f_{big} = (g \circ f)_{big}$.
Proof. This follows from the simple description of pushforward and pullback for the functors on the big sites from Lemma 73.8.8. $\square$
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