Degenerate tiling incidence conjecture over division rings

From papers

Let T\mathcal T be a simple tiling of a surface of positive genus, meaning that its underlying graph is (n+1)(n+1)-degenerate, and let D{\mathrm D} be a division ring. The incidence theorem corresponding to T\mathcal T is an incidence statement in projective space Pn(D)\mathbb{P}^n({\mathrm D}). Degenerate tiling incidence conjecture. The incidence theorem corresponding to T\mathcal T holds in Pn(D)\mathbb{P}^n({\mathrm D}) if and only if D{\mathrm D} is commutative. This would extend the preceding argument from the specific tiling considered there to all simple (n+1)(n+1)-degenerate tilings of positive-genus surfaces; combined with bounds on the degeneracy of graphs embeddable in a fixed genus, it would imply corresponding dimension thresholds for all simple tilings of a fixed positive genus.

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Primary source

Anton Izosimov, “Surface topology and incidence theorems over division rings”, arXiv:2603.00288 (2026).

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