| 11. | This allows the entire chain complex to be treated as a functor.
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| 12. | Under the forgetful functor, this morphism yields the identity.
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| 13. | This gives a contravariant functor from manifolds to abelian groups.
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| 14. | This functor is left adjoint to the corresponding forgetful functor.
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| 15. | This functor is left adjoint to the corresponding forgetful functor.
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| 16. | The most important examples of subfunctors are subfunctors of the Hom functor.
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| 17. | The functor returns a structure that follows the ORD _ MAP interface.
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| 18. | The pushforward is the morphism corresponding to the homology functor.
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| 19. | Every flat resolution is acyclic with respect to this functor.
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| 20. | A continuous functor sends covering sieves to covering sieves.
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