Bounded convex decomposition conjecture for rotation sets of surface homeomorphisms

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Let SS be a surface of genus g≥2g\ge 2, and let f∈Homeo⁡0(S)f\in\operatorname{Homeo}_0(S). Write rot⁡(f)\operatorname{rot}(f) for the rotation set of ff.

Bounded convex decomposition conjecture. There exists a map

m:N≥2→Nm:\mathbf{N}_{\ge 2}\to\mathbf{N}

such that, for every surface SS of genus g≥2g\ge 2 and every f∈Homeo⁡0(S)f\in\operatorname{Homeo}_0(S), the rotation set rot⁡(f)\operatorname{rot}(f) is the union of at most m(g)m(g) convex sets. Moreover,

m(g)≤25g−5.m(g)\le 2^{5g-5}.

This conjecture suggests that rotation sets of arbitrary surface homeomorphisms admit a uniformly bounded decomposition into convex pieces depending only on the genus. The supplied text gives no resolution status beyond posing the statement as a suggested persistence of the preceding theorem.

References

Primary source

Pierre-Antoine Guihéneuf, “Surface homeomorphisms with big rotation set”, arXiv:2511.15220 (2026).

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