q-Markov function conjecture for mirror Markov-tree branches

Fix a Markov number 5\ell\geq 5. Let m(q)m_\ell(q) be a mirror deformation of \ell, and let (pn)n0(p_n)_{n\geq 0} be the sequence of polynomials on a mirror Markov-tree branch fixing mm_\ell, with p0=mp_0=m_\ell. Define

M=m(q)m(q1),Pn=pn(q)pn(q1).M=m_\ell(q)m_\ell(q^{-1}),\qquad P_n=p_n(q)p_n(q^{-1}).

For the branch (m,pn1,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 a(q)Z0[q]a_\ell(q)\in\mathbb{Z}_{\geq 0}[q] of \ell such that

Mq(m,pn1,pn)=qdM+qd+εPn+qdεPn1apnpn1\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.

Sources & referencesView supporting material

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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