Ballantine--Burson--Craig--Folsom--Wen hook length bias conjecture for self-conjugate partitions

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For each nn, let SC(n)\mathcal{SC}(n) be the set of self-conjugate partitions of nn, let DO(n)\mathcal{DO}(n) be the set of partitions of nn with distinct odd parts, and let nt(λ)n_t(\lambda) denote the number of hooks of length tt in a partition λ\lambda. Define

at∗(n):=∑λ∈SC(n)nt(λ),bt∗(n):=∑λ∈DO(n)nt(λ).a_t^*(n):=\sum_{\lambda\in\mathcal{SC}(n)}n_t(\lambda),\qquad b_t^*(n):=\sum_{\lambda\in\mathcal{DO}(n)}n_t(\lambda).

Ballantine--Burson--Craig--Folsom--Wen hook length bias conjecture. For every integer t≥2t\geq 2, both of the following hold:

  1. There exists an integer Nt∗N_t^* such that at∗(n)≥bt∗(n)a_t^*(n)\geq b_t^*(n) for all n>Nt∗n>N_t^*.
  2. There exists a constant γt∗>1\gamma_t^*>1 such that
at∗(n)bt∗(n)⟶γt∗as n⟶∞.\frac{a_t^*(n)}{b_t^*(n)}\longrightarrow\gamma_t^* \quad\text{as }n\longrightarrow\infty.

The conjecture formulates the eventual hook-length bias between self-conjugate partitions and partitions with distinct odd parts; the source says that Craig, Dawsey, and Han proved the corresponding conjecture, so both assertions are solved.

References

Primary source

Catherine Cossaboom, “Hook length biases for self-conjugate partitions and partitions with distinct odd parts”, arXiv:2406.18480 (2024).

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