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Eventual homotopy vanishing of the motivic tower

PDF p. 4: Motivic graded spectral sequence; PDF p. 9: Eventual filtration vanishing

Statement

Assume the Axiom of Choice. Let X be a finite-dimensional Noetherian equicharacteristic scheme of Krull dimension d, with equicharacteristic meaning that its structure map factors through Spec⁡Q or Spec⁡Fp. Use the actual source motivic filtration on that prime-field category; on schemes over the standing field this is exactly the completed local filtration. Then for each fixed integer q≤0 used in the article there is ℓ0(q) such that πqFmotd+ℓK(X)=0(ℓ≥ℓ0(q)). Indeed the same eventual vanishing holds in every fixed integer homotopy degree. The threshold may depend on that degree. The finite-valuative-dimension requirement of the source is satisfied because dim⁡vX=dim⁡X for Noetherian schemes. This is vanishing of the actual stage groups, stronger than merely vanishing of their images in Kq(X).

Facts & Assumptions

Given: The Axiom of Choice and the stated Noetherian finite-dimensional scheme and actual compatible source filtration.

Goal: Supply the exact eventual-stage assertion used in the article without narrowing the original scheme scope.

[F3]

Degreewise boundedness and finite collections of eventual vanishings records the equivalent degreewise property and finite-degree compatibility without asserting an unqualified uniform bound.

[F4]

The assumed The Axiom of Choice discharges the inherited Choice premises of [F1]–[F3] and Motivic filtration and image groups when their selected actual source tower and perfect-complex K-theory realization are used. It adds no restriction to the geometric scope of X.

[F5]

Every actual motivic stage on the empty scheme is zero proves zero actual stages on the empty scheme without invoking nonempty-scheme suppliers or a descent property of the stages.

Proof

1.1F1F2F4F5given

If X is empty, [F5] gives all stage vanishings at every integer index, so the eventual assertion holds for any integer anchor without using a source empty-dimension convention. Suppose henceforth that X is nonempty. Under the inherited Choice premise in [F4], by [F1] the scheme is in the source’s qcqs prime-field domain and has finite source valuative dimension. The source boundedness theorem therefore gives B(X) and the stagewise homotopy interpretation of [F2]. When X is over the standing field, these are the same actual stage maps as the completed local definition.

2.1F1F2F3step 1.1∎

Apply the threshold lemma of [F2] with anchor t=d. It gives the conclusion for each fixed q, including all the nonpositive degrees required by the article. The local degreewise statement and finite-set version are [F3]. This proves the full proposition.

Depends on

Used by · 1

Dependency tree · 3 levels

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Sources

  • Fasel–Yakerson · p. 9, Lemma 4.2 proof
  • Elmanto–Morrow · arXiv v1, header September 15, 2023; internal date September 18, 2023; Section 2.2 pp.11–12; Theorems 4.12(1) p.22 and 4.27(1) p.29; boundedness paragraphs pp.23 and29