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Motivic weight zero on all qcqs schemes
PDF p. 4: Property (1)
Statement
Assume the Axiom of Choice and fixed compatible site and universe size bounds for the constructions below. Let be any qcqs -scheme and let be the prime subfield of . For use the ordinary constant integer sheaf on the general qcqs -scheme cdh site specified by the preceding qcqs-site construction, evaluated at the underlying -scheme . Then there is a natural equivalence and natural isomorphisms for all integers . Negative-degree groups vanish. The site convention is part of this statement and covers every qcqs .
Statement references
Facts & Assumptions
Choice and the fixed compatible site and universe bounds are retained when applying Constant integer coefficients and exact derived evaluation and Weight-zero sections and cohomology on the chosen general site in steps 1.1 and 2.1. They supply the derived constant-sheaf interpretation and its negative-degree vanishing. The Axiom of Choice
Given: The hypotheses in the statement.
Goal: Establish the displayed construction or conclusion with its actual maps.
The five supplied lemmas, with their explicit site and map conventions: The source qcqs cdh site, Constant integer coefficients and exact derived evaluation, Prime-field restriction preserves actual comparison diagrams, Equivalence of the weight-zero pullback projection and Weight-zero sections and cohomology on the chosen general site.
Proof
The first three supplied lemmas fix the precise general site, ordinary constant sheaf, derived evaluation, and actual prime-field restriction. The fourth proves that the actual source projection is an equivalence. Thus all hypotheses of the fifth lemma are satisfied for the given qcqs .
Apply that lemma. It supplies the displayed natural map and equivalence, its cohomology isomorphisms and negative-degree vanishing. This proves the full qcqs statement using the source’s site directly; the narrower completed site supplier has not been altered or silently substituted.
Depends on
Dependency tree · 3 levels
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Sources
- Fasel–Yakerson · p. 4, property (1)