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generalize result to pointed categories
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database/data/005_implications/008_topos-theory-implications.sql

Lines changed: 2 additions & 2 deletions
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@@ -204,8 +204,8 @@ VALUES
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),
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(
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'nno_additive_case',
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'["natural numbers object", "additive"]',
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'["natural numbers object", "pointed"]',
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'["trivial"]',
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'Let $(N,z,s)$ be a natural numbers object in an additive category. The morphism $z : 0 \to N$ must be the zero morphism. The universal property applied to $A=1$ implies that $s : N \to N$ is an initial object in the category of endomorphisms. This exists, it is given by the identity $0 \to 0$. Therefore, $N = 0$. The general universal property now becomes: For all $f : A \to X$, $g : X \to X$ there is a unique $\Phi : A \to X$ such that $\Phi(a) = f(a)$ and $\Phi(a)=g(\Phi(a))$. Apply this to $g = 0$ to conclude $f = 0$ for all $f$.',
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'Let $(N,z,s)$ be a natural numbers object in a category with a zero object, denoted $0$. The morphism $z : 0 \to N$ must be zero. The universal property applied to $A=1$ implies that $s : N \to N$ is an initial object in the category of endomorphisms. This exists, it is given by the identity $0 \to 0$. Therefore, $N = 0$. The general universal property now becomes: For all $f : A \to X$, $g : X \to X$ there is a unique $\Phi : A \to X$ such that $\Phi(a) = f(a)$ and $\Phi(a)=g(\Phi(a))$. Apply this to $g = 0$ to conclude $f = 0$.',
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FALSE
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);

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