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Record W1584573301

On minimal graded free resolutions

2001· dissertation· en· W1584573301 on OpenAlex

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fundA Canadian funder is recorded on the work.
no affNo Canadian affiliation: this work is invisible to an affiliation-only frame.
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Bibliographic record

VenueDuEPublico (University of Duisburg-Essen) · 2001
Typedissertation
Languageen
FieldMathematics
TopicCommutative Algebra and Its Applications
Canadian institutionsnot available
FundersUniversity of TorontoDeutsche Forschungsgemeinschaft
KeywordsPolynomial ringGraded ringMathematicsHilbert's syzygy theoremBetti numberCommutative algebraRing (chemistry)Pure mathematicsResolution (logic)Free algebraHilbert–Poincaré seriesIdeal (ethics)Algebra over a fieldPolynomialAlgebra representationCellular algebraMathematical analysisComputer science
DOInot available

Abstract

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Minimal graded free resolutions are an important and central topic in algebra.They are a useful tool for studying modules over finitely generated graded Kalgebras.Such a resolution determines the Hilbert series, the Castelnuovo-Mumford regularity and other invariants of the module.This thesis is concerned with the structure of minimal graded free resolutions.We relate our results to several recent trends in commutative algebra.The first of these trends (see [13,22,33,34,49]) deals with relations between properties of the Stanley-Reisner ring associated to a simplicial complex and the Stanley-Reisner ring of its Alexander dual.Another development is the investigation of the linear part of a minimal graded free resolution by Eisenbud and Schreyer in [26].Several authors were interested in the problem to give lower bounds for the Betti numbers of a module.In particular, Eisenbud-Koh [24], Green [31], Herzog [32] and Reiner-Welker [42] studied the graded Betti numbers which determine the linear strand of a minimal graded free resolution.Bigraded algebras occur naturally in many research areas of commutative algebra.A typical example of a bigraded algebra is the Rees ring of a graded ideal.In [21] Cutkosky, Herzog and Trung used this bigraded structure of the Rees ring to study the Castelnuovo-Mumford regularity of powers of graded ideals in a polynomial ring.Conca, Herzog, Trung and Valla dealt with diagonal subalgebras of bigraded algebras in [20].Aramova, Crona and De Negri studied homological properties of bigraded K-algebras in [3].This thesis is divided in 6 chapters.Chapter 1 introduces definitions, notation and gives a short survey on those facts which are relevant in the following chapters.Recently Yanagawa [53] introduced the category of square-free modules over a polynomial ring S = K[x 1 , . . ., x n ].This concept generalizes Stanley-Reisner rings associated to simplicial complexes.In Chapter 2 we define the generalized Alexander dual for square-free S-modules.This definition is a natural extension of the well-known Alexander duality for simplicial complexes.Miller [40] studied Alexander duality in a more general situation.In the case of square-free S-modules his definition and ours coincide.We extend homological theorems on Stanley-Reisner rings to square-free Smodules.Bayer, Charalambous and S. Popescu introduced in [13] the extremal Betti numbers, which are a refinement of the Castelnuovo-Mumford regularity and of the projective dimension of a finitely generated graded S-module.Theorem 2.2.9 states that there is a 1-1 correspondence between the extremal Betti numbers of a

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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)0.001
Version: codex-gemma-dda1882f352aValidation status: machine_predicted_unvalidated
Candidate categoriesMeta-epidemiology (narrow), Insufficient payload (model declined to judge)
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 score0.117
Threshold uncertainty score1.000

Codex and Gemma teacher scores by category

CategoryCodexGemma
Metaresearch0.0000.001
Meta-epidemiology (narrow)0.0000.001
Meta-epidemiology (broad)0.0010.000
Bibliometrics0.0010.001
Science and technology studies0.0010.000
Scholarly communication0.0000.000
Open science0.0010.000
Research integrity0.0000.001
Insufficient payload (model declined to judge)0.0030.000

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 head0.034
GPT teacher head0.278
Teacher spread0.244 · 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