arXiv:2610.37931v1 Announce Type: new Abstract: For $p,q$ natural numbers, define $\Delta^{\langle p,q \rangle}:=x^{p-1}\frac{\partial}{\partial y} + y^{q-1}\frac{\partial}{\partial x}$, and consider the sequence of polynomials $\biggl((\Delta^{\langle p,q \rangle})^n \cdot x\biggr)_{n\geq 0}$; we call these the generalised hyperbolic polynomials. In this paper, we provide a simple combinatorial interpretation for these polynomials. As special cases, we obtain combinatorial interpretations for the coefficients of the analogs of sinh and cosh corresponding to the curve $x^p- p y^q/q=1$; on setting $p=q=3$, we obtain Conrad and Flajolet's tree interpretation for the coefficients of the Dixonian elliptic functions (2006) as a special case. Finally, we show that for any $p,q\geq 3$, after suitably normalising followed by substituting $y=1$, we obtain a sequence of univariate polynomials which are real-rooted.
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