The Stacks project

Definition 85.5.9. Let $S$ be a scheme. Let $A$ be a weakly admissible topological ring over $S$, see Definition 85.4.81. The formal spectrum of $A$ is the affine formal algebraic space

\[ \text{Spf}(A) = \mathop{\mathrm{colim}}\nolimits \mathop{\mathrm{Spec}}(A/I) \]

where the colimit is over the set of weak ideals of definition of $A$ and taken in the category $\mathop{\mathit{Sh}}\nolimits ((\mathit{Sch}/S)_{fppf})$.

[1] See More on Algebra, Definition 15.36.1 for the classical case and see Remark 85.2.3 for a discussion of differences.

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