Definition 4.5.2 (04AP)—The Stacks project

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Definition 4.5.2. We say the category $\mathcal{C}$ has coproducts of pairs of objects if a coproduct $x \amalg y$ exists for any $x, y \in \mathop{\mathrm{Ob}}\nolimits (\mathcal{C})$ .

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