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Record W2601196922 · doi:10.46298/dmtcs.2478

Factoring peak polynomials

2015· article· en· W2601196922 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

VenueDiscrete Mathematics & Theoretical Computer Science · 2015
Typearticle
Languageen
FieldMathematics
TopicAdvanced Combinatorial Mathematics
Canadian institutionsToronto Metropolitan University
FundersUniversity of WashingtonNational Science Foundation
KeywordsPiCombinatoricsMathematicsPermutation (music)Integer (computer science)Binomial coefficientConjectureDiscrete mathematicsPhysicsGeometry

Abstract

fetched live from OpenAlex

Given a permutation $\pi=\pi_1\pi_2\cdots \pi_n \in S_n$, we say an index $i$ is a peak if $\pi_{i-1} < \pi_i > \pi_{i+1}$. Let $P(\pi)$ denote the set of peaks of $\pi$. Given any set $S$ of positive integers, define ${P_S(n)=\{\pi\in S_n:P(\pi)=S\}}$. Billey-Burdzy-Sagan showed that for all fixed subsets of positive integers $S$ and sufficiently large $n$, $|P_S(n)|=p_S(n)2^{n-|S|-1}$ for some polynomial $p_S(x)$ depending on $S$. They conjectured that the coefficients of $p_S(x)$ expanded in a binomial coefficient basis centered at $max(S)$ are all positive. We show that this is a consequence of a stronger conjecture that bounds the modulus of the roots of $p_S(x)$. Furthermore, we give an efficient explicit formula for peak polynomials in the binomial basis centered at $0$, which we use to identify many integer roots of peak polynomials along with certain inequalities and identities. Etant donné une permutation $\pi=\pi_1\pi_2\cdots \pi_n \in S_n$ du groupe symétrique, nous disons qu’un indice i est unsommet si $\pi_{i-1} < \pi_i > \pi_{i+1}$. Soit $P(\pi)$ l’ensemble des sommets de $\pi$. Billey-Burdzy-Sagan ont montré que,pour tout sous-ensemble d’entiers positifs S et n suffisamment grand, le nombre de permutations de $n$ éléments avecensemble de sommets $S$ est $|P_S(n)|=p_S(n)2^{n-|S|-1}$ pour un certain polynôme $p_S(x)$ dépendant de $S$.. Ils ont fait la conjectureque les coefficients du polynôme $p_S(x)$ exprimé dans une base de coefficients binomiaux centrée en $max(S)$ sont touspositifs. Nous montrons que cela découle d’une conjecture plus forte qui borne le module des racines du polynôme$p_S(x)$. De plus, nous donnons une formule explicite efficace pour les polynômes sommets dans la base binomialecentrée en $0$, que nous utilisons pour identifier plusieurs racines entières de polynômes sommets, ainsi que certainesinégalités et identités.

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)0.003
metaresearch head score (Gemma)0.004
Version: codex-gemma-dda1882f352aValidation status: machine_predicted_unvalidated
Candidate categoriesMeta-epidemiology (narrow)
Consensus categoriesnone
DomainCandidate signal: none · Consensus signal: none
Study designCandidate signal: Theoretical or conceptual · Consensus signal: Theoretical or conceptual
GenreCandidate signal: Methods · Consensus signal: none
Teacher disagreement score0.514
Threshold uncertainty score1.000

Codex and Gemma teacher scores by category

CategoryCodexGemma
Metaresearch0.0030.004
Meta-epidemiology (narrow)0.0010.000
Meta-epidemiology (broad)0.0010.000
Bibliometrics0.0000.001
Science and technology studies0.0000.002
Scholarly communication0.0000.001
Open science0.0020.001
Research integrity0.0000.000
Insufficient payload (model declined to judge)0.0000.000

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 head0.050
GPT teacher head0.330
Teacher spread0.280 · 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