Definition 4.12.1. Let \mathcal{C} be a category.
An object x of the category \mathcal{C} is called an initial object if for every object y of \mathcal{C} there is exactly one morphism x \to y.
An object x of the category \mathcal{C} is called a final object if for every object y of \mathcal{C} there is exactly one morphism y \to x.
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