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thin categories have NNO
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database/data/005_implications/008_topos-theory-implications.sql

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@@ -215,4 +215,11 @@ VALUES
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'["one-way"]',
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'By assumption, $z : 1 \to N$ is an isomorphism. Therefore, the terminal object $1$ is a NNO with $z = \mathrm{id}_1$ and $s = \mathrm{id}_1$. This precisely means that for all $f : A \to X$ and $g : X \to X$ there is a unique $\Phi : A \to X$ with $\Phi = f$ and $\Phi = g \circ \Phi$. In other words, we have $f = g \circ f$, and therefore $g = \mathrm{id}_X$ (take $f = \mathrm{id}_X$), which proves the claim. (From here one can <a href="/category-implication/one-way_products_thin">further deduce</a> that the category is thin.)',
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FALSE
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),
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(
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'nno_thin',
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'["finite products", "thin"]',
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'["natural numbers object"]',
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'The triple $(1, \mathrm{id}_1, \mathrm{id}_1)$ is clearly a NNO.',
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FALSE
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);

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