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Record W2059887287 · doi:10.1145/2442829.2442881

Computing minimal nullspace bases

2012· article· en· W2059887287 on OpenAlexaff
Wei Zhou, George Labahn, Arne Storjohann

Bibliographic record

Venuenot available
Typearticle
Languageen
FieldComputer Science
TopicPolynomial and algebraic computation
Canadian institutionsUniversity of Waterloo
Fundersnot available
KeywordsBasis (linear algebra)MathematicsMatrix (chemical analysis)Field (mathematics)Degree (music)UnivariateMatrix multiplicationExponentComputationCombinatoricsDiscrete mathematicsAlgorithmPure mathematicsGeometryStatistics

Abstract

fetched live from OpenAlex

In this paper we present a deterministic algorithm for the computation of a minimal nullspace basis of an m x n input matrix of univariate polynomials over a field K with m ≤ n. This algorithm computes a minimal nullspace basis of a degree d input matrix with a cost of O~ (nω ⌈md/n⌉) field operations in K. Here the soft-O notation is Big-O with log factors removed while ω is the exponent of matrix multiplication. The same algorithm also works in the more general situation on computing a shifted minimal nullspace basis, with a given degree shift [equation] whose entries bound the corresponding column degrees of the input matrix. In this case if ρ is the sum of the m largest entries of s, then a s-minimal right nullspace basis can be computed with a cost of O~(nωρ/m) field operations.

Fetched live from OpenAlex and de-inverted. Abstracts are not stored in this database: the inverted indexes are 8.6 GB of the frame’s 9.3 GB of text, and the host has 13 GB free.

How this classification was reachedexpand

Full frame machine prediction

Teacher imitation

Not calibrated prevalence, not ground truth. Human validation pending. The Gemma side is a direct model label for every work in the frame, read from the title-only record. The Codex side is a classifier learned from the 10,348 direct Codex labels and calibrated to design-weighted sample rates; fields without enough sample support carry no Codex call. Candidate is the union of the two sides; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels.

metaresearch head score (Codex)0.000
metaresearch head score (Gemma)0.003
Version: metacan-v3-hybrid-931329e0061cValidation status: machine_predicted_unvalidated
Candidate categoriesnone
Consensus categoriesnone
DomainCandidate signal: none · Consensus signal: none
Study designCandidate signal: Theoretical or conceptual · Consensus signal: none
GenreCandidate signal: Empirical · Consensus signal: none
Teacher disagreement score0.007
Threshold uncertainty score0.024

Distilled classifier scores by category (both heads)

CategoryCodexGemma
Metaresearch0.0000.003
Meta-epidemiology (narrow)0.0000.000
Meta-epidemiology (broad)0.0010.001
Bibliometrics0.0010.001
Science and technology studies0.0010.001
Scholarly communication0.0010.002
Open science0.0010.002
Research integrity0.0000.001
Insufficient payload (model declined to judge)0.0070.002

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 head0.018
GPT teacher head0.249
Teacher spread0.231 · 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

Classification

machine, unvalidated

Machine predicted; a candidate call from one source (direct Gemma or distilled Codex), not a consensus.

The models applied no category: nothing in the taxonomy fit this work.
Study designTheoretical or conceptual
Domainnot available
GenreEmpirical

How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".

Quick stats

Citations34
Published2012
Admission routes1
Has abstractyes

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Same topicPolynomial and algebraic computationFrench-language works237,207