Perfectoid Space
Perfectoid spaces glue affinoid charts built from perfectoid algebras. Start with their local definition and use the preceding affinoid results to understand why these charts support a sheaf.
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Where to read
Start here: Perfectoid Spaces
Peter Scholze · Research paper · English · Free full text
Section 6, Theorem 6.3 and Definition 6.15, printed pp. 30 and 38
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Algebraic Geometry in the library · Preparation and skip guidance