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Record W2098717294 · doi:10.1112/s0010437x06002053

Chow motives of twisted flag varieties

2006· article· en· W2098717294 on OpenAlex

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Bibliographic record

VenueCompositio Mathematica · 2006
Typearticle
Languageen
FieldMathematics
TopicAlgebraic Geometry and Number Theory
Canadian institutionsUniversity of Alberta
FundersDeutscher Akademischer AustauschdienstAlexander von Humboldt-Stiftung
KeywordsMathematicsBrauer groupFlag (linear algebra)Variety (cybernetics)Projective varietyAlgebraic groupPure mathematicsHomogeneousUniquenessDivision (mathematics)Algebra over a fieldDivision algebraAlgebraic varietyAlgebraic numberCombinatoricsMathematical analysisArithmeticSubalgebra

Abstract

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Let G be an adjoint simple algebraic group of inner type. We express the Chow motive (with integral coefficients) of an anisotropic projective G-homogeneous variety in terms of motives of simpler G-homogeneous varieties, namely, those that correspond to maximal parabolic subgroups of G. We decompose the motive of a generalized Severi-Brauer variety SB 2 (A) of a division algebra A of degree 5 into a direct sum of twisted motives of the Severi-Brauer variety SB(B) of a division algebra B Brauer-equivalent to the tensor square A 2 . As an application we provide another counter-example to the uniqueness of a direct sum decomposition in the category of motives with integral coefficients.

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Full frame distilled prediction

Teacher imitation

Not calibrated prevalence, not ground truth. Human validation pending. Learned from the 10,348 direct Codex labels and 10,348 direct Gemma labels. Candidate is the union of thresholded teacher heads; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels or direct frontier model labels.

metaresearch head score (Codex)0.000
metaresearch head score (Gemma)0.000
Version: codex-gemma-dda1882f352aValidation status: machine_predicted_unvalidated
Candidate categoriesnone
Consensus categoriesnone
DomainCandidate signal: none · Consensus signal: none
Study designCandidate signal: Theoretical or conceptual · Consensus signal: Theoretical or conceptual
GenreCandidate signal: Empirical · Consensus signal: Empirical
Teacher disagreement score0.154
Threshold uncertainty score0.772

Codex and Gemma teacher scores by category

CategoryCodexGemma
Metaresearch0.0000.000
Meta-epidemiology (narrow)0.0000.000
Meta-epidemiology (broad)0.0000.000
Bibliometrics0.0000.000
Science and technology studies0.0000.000
Scholarly communication0.0000.000
Open science0.0000.000
Research integrity0.0000.000
Insufficient payload (model declined to judge)0.0010.000

Machine scores (provisional)

The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.

Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.

Opus teacher head0.021
GPT teacher head0.267
Teacher spread0.246 · how far apart the two teachers sit on this one work
Validation statusscore_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from it