Page "Category theory" Paragraph 60
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* Duality: Every statement, theorem, or definition in category theory has a dual which is essentially obtained by " reversing all the arrows ".
If one statement is true in a category C then its dual will be true in the dual category C < sup > op </ sup >.
This duality, which is transparent at the level of category theory, is often obscured in applications and can lead to surprising relationships.
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