Positivity and sum-rule conjecture for tau-deformed special values

From papers

For a matching π\pi, define Gπ(τ)=Ψπ(τ,π)G_\pi(\tau)=\Psi_\pi(\tau,-|\pi|). Let d(π)d(\pi) be the degree parameter used in the source, and let Ψπ(τ)\Psi_\pi(-\tau) denote the specialization Ψπ(τ,0)\Psi_\pi(-\tau,0). Tau-deformed positivity and sum-rule conjecture.

Gπ(τ)=(1)d(π)gπ(τ),G_\pi(\tau)=(-1)^{d(\pi)}g_\pi(\tau),

where gπ(τ)g_\pi(\tau) is a polynomial with nonnegative integer coefficients, and

πGπ(τ)=πΨπ(τ).\sum_\pi G_\pi(\tau)=\sum_\pi\Psi_\pi(-\tau).

These conjectural properties were checked in the computed range π8|\pi|\leq8; their general validity remains open.

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Sources & referencesView supporting material

Primary source

Tiago Fonseca and Philippe Nadeau, “On some polynomials enumerating Fully Packed Loop configurations”, arXiv:1002.4187 (2010).

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