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This is probably highly trivial, but I don't see how the zero morphism from A to B is the zero element of Hom(A,B) (as an abelian group). Anyone care…

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  1. Morphism
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  2. 0 object
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  3. Kernel category
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  4. Initial object
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  5. Cokernel
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  6. Small category
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  7. Biproduct
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  8. Category math
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