Even-dimensional single-valuedness conjecture for graphical functions

Let GG be a weighted graph whose graphical function fG(z)f_G(z) exists in dimension D=2λ+23D=2\lambda+2\geq3. Let SV{0,1,}\mathcal{S}\mathcal{V}_{\{0,1,\infty\}} denote the space of functions on C{0,1}\mathbb{C}\setminus\{0,1\} that are analytic in zz and z\overline{z} and have single-valued log-Laurent expansions at 00, 11, and \infty. The even-dimensional single-valuedness conjecture. Statement (G3) of Theorem 1 remains valid if the condition D=4D=4 and νe=1\nu_e=1 for all eEGe\in\mathcal{E}_G is weakened to

D=2λ+24 is evenandλνeZ for all eEG.D=2\lambda+2\geq4\text{ is even}\qquad\text{and}\qquad\lambda\nu_e\in\mathbb{Z}\text{ for all }e\in\mathcal{E}_G.

The claim extends the known single-valued log-Laurent expansion property from four-dimensional unit-weight graphs to even dimensions with integral rescaled edge weights. The supplied text gives no resolution, so the conjecture remains open.

Sources & referencesView supporting material

Primary source

Michael Borinsky and Oliver Schnetz, “Graphical functions in even dimensions”, arXiv:2105.05015 (2026).

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