In category theory, a branch of mathematics, the opposite category or dual category C op {\displaystyle C^{\text{op}}} of a given category C {\displaystyle C} is formed by reversing the morphisms, i.e. interchanging the source and target of each morphism.
In category theory, a branch of mathematics, the opposite category or dual category C op {\displaystyle C^{\text{op}}} of a given category C {\displaystyle C} is formed by reversing the morphisms, i.e. interchanging the source and target of each morphism.
Source: Wikipedia "Opposite category" · CC BY-SA 4.0
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