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In [[category theory]], a morphism is a mapping between two categories. For example, morphisms between sets are functions; morphisms between groups are group homomorphisms; morphisms between topological spaces are continuous functions.
In [[category theory]], a morphism is a mapping between two categories. For example, morphisms between sets are functions; morphisms between groups are group homomorphisms; morphisms between topological spaces are continuous functions; morphisms between category of functors are natural transformations.