The Stacks project

Definition 4.12.1. Let $\mathcal{C}$ be a category.

  1. 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 $x \to y$.

  2. 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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View Definition 4.12.1 as pdf