q-Markov function conjecture for mirror Markov-tree branches

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Fix a Markov number ℓ≥5\ell\geq 5. Let mℓ(q)m_\ell(q) be a mirror deformation of ℓ\ell, and let (pn)n≥0(p_n)_{n\geq 0} be the sequence of polynomials on a mirror Markov-tree branch fixing mℓm_\ell, with p0=mℓp_0=m_\ell. Define

M=mℓ(q)mℓ(q−1),Pn=pn(q)pn(q−1).M=m_\ell(q)m_\ell(q^{-1}),\qquad P_n=p_n(q)p_n(q^{-1}).

For the branch (mℓ,pn−1,pn)(m_\ell,p_{n-1},p_n), let ε=1\varepsilon=1 for a red branch and ε=−1\varepsilon=-1 for a blue branch, and set d=deg⁡(pn+1)+εd=\deg(p_{n+1})+\varepsilon. q-Markov function conjecture. There exists a possibly different qq-deformation aℓ(q)∈Z≥0[q]a_\ell(q)\in\mathbb{Z}_{\geq 0}[q] of ℓ\ell such that

Mqℓ(mℓ,pn−1,pn)=qdM+qd+εPn+qd−εPn−1aℓpnpn−1\mathcal{M}_q^{\ell}(m_\ell,p_{n-1},p_n)=\frac{q^{d}M+q^{d+\varepsilon}P_n+q^{d-\varepsilon}P_{n-1}}{a_\ell p_np_{n-1}}

is constantly equal to [3]q[3]_q. This is presented as an open question, with only computational evidence and no stated resolution.

References

Primary source

Léa Bittmann, Perrine Jouteur, Ezgi Kantarcı Oğuz, Melody Molander and Emine Yıldırım, “A mirror deformation of Markov numbers”, arXiv:2602.14802 (2026).

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