Minimality conjecture for the pole-order integer in separated variables

Let pp be the plane algebraic curve under consideration, let rr be the relevant polynomial or function, and suppose F(p)\mathrm{F}(p) is trivial. Let ω\omega be the valuation used in the source, let (fω,gω)(f_\omega,g_\omega) be a generator of F(lpω(p))\mathrm{F}(\mathrm{lp}_\omega(p)), and let kk be the integer occurring in equation (mult), which relates the leading parts of fgf-g to fωkgωkf_\omega^k-g_\omega^k.

Minimality conjecture. If F(p)\mathrm{F}(p) is trivial, then the integer kk in equation (mult) is minimal such that

ω(r)<kω(fω).\omega(r)<k\cdot\omega(f_\omega).

The conjecture is intended to control the multiplicities of poles of separated-variable functions on finite orbits, in a situation where the corresponding upper-bound proposition is unavailable because F(p)\mathrm{F}(p) is trivial. Its status is not established in the supplied text.

Sources & referencesView supporting material

Primary source

Manfred Buchacher, “Separated Variables on Plane Algebraic Curves”, arXiv:2411.08584 (2025).

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