Definition 4.2.4. A morphism \phi : x \to y is an isomorphism of the category \mathcal{C} if there exists a morphism \psi : y \to x such that \phi \circ \psi = \text{id}_ y and \psi \circ \phi = \text{id}_ x.
Definition 4.2.4. A morphism \phi : x \to y is an isomorphism of the category \mathcal{C} if there exists a morphism \psi : y \to x such that \phi \circ \psi = \text{id}_ y and \psi \circ \phi = \text{id}_ x.
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