Definition 6.25.1. A *ringed space* is a pair $(X, \mathcal{O}_ X)$ consisting of a topological space $X$ and a sheaf of rings $\mathcal{O}_ X$ on $X$. A *morphism of ringed spaces* $(X, \mathcal{O}_ X) \to (Y, \mathcal{O}_ Y)$ is a pair consisting of a continuous map $f : X \to Y$ and an $f$-map of sheaves of rings $f^\sharp : \mathcal{O}_ Y \to \mathcal{O}_ X$.

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