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Record W2594577662 · doi:10.1307/mmj/1049832898

Rectification of circles and quaternoins

2003· article· fr· W2594577662 on OpenAlex

Why this work is in the frame

A frame that forgets how it found something cannot be audited. These are the routes that admitted this work.

affAt least one author lists a Canadian institution in the pinned OpenAlex snapshot.

Bibliographic record

VenueThe Michigan Mathematical Journal · 2003
Typearticle
Languagefr
FieldEngineering
TopicAdvanced Theoretical and Applied Studies in Material Sciences and Geometry
Canadian institutionsUniversity of Toronto
Fundersnot available
KeywordsMathematicsLine bundlePure mathematicsSimple (philosophy)Jordan curve theoremTangent bundleGeodesicNormal bundleBundleTautological line bundleDimension (graph theory)Euclidean geometryMathematical analysisGeometryTangent spaceFrame bundleVector bundle

Abstract

fetched live from OpenAlex

Throughout this paper, the word “circle” means a circle or a straight line. We are always assuming that the space R is equipped with a fixed “standard” Euclidean inner product. A collection of curves in R passing through 0 is said to be a simple bundle of curves if no two of them are tangent at 0. A simple bundle of curves is called rectifiable if there exists a germ of diffeomorphism in a neighborhood of the origin that sends all curves from this bundle to straight lines. Rectifiable bundles of curves appear, for example, in Riemannian geometry — the set of geodesics passing through a given point is rectifiable. A. G. Khovanskii proved in [1] that a rectifiable simple bundle of more than 6 circles on plane necessarily pass through some point different from the origin. F. A. Izadi [2] generalized Khovanskii’s arguments to dimension 3. A rectifiable simple bundle of circles in R containing sufficiently many circles in general position must pass through some other common point. In dimension 4, this is not true. The simplest counterexample is a family of circles that are obtained from straight lines by some complex projective transformation (with respect to some identification R = C such that the multiplication by i is an orthogonal operator). It turns out that in dimension 4 there is a large family of transformations that round lines (i.e., take them to circles). To construct such a family, fix a quaternionic structure on R compatible with the Euclidean structure. If A and B are some affine maps, then the map x 7→ A(x)−1B(x) rounds lines (the multiplication and the inverse are in the sense of quaternions). Such transformations will be called (left) quaternionic fractional transformations. Right quaternionic fractional transformations AB−1 also round ∗Partially supported by RFBR 99-01-00245 and CRDF RM1-2086

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.

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)0.001
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 score0.198
Threshold uncertainty score0.550

Codex and Gemma teacher scores by category

CategoryCodexGemma
Metaresearch0.0010.000
Meta-epidemiology (narrow)0.0000.000
Meta-epidemiology (broad)0.0000.000
Bibliometrics0.0000.000
Science and technology studies0.0000.001
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 head0.010
GPT teacher head0.230
Teacher spread0.220 · 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