Boshernitzan–Kornfeld conjecture on the prevalence of finite type interval translation maps

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Let r⩾2r\geqslant 2, and let ITM(r)\mathrm{ITM}(r) denote the space of interval translation maps on rr intervals. An interval translation map is of infinite type when, for its attractor construction Xn=Tn(I)X_n=T^n(I), one has Xn+1⊊XnX_{n+1}\subsetneq X_n for every nn. Boshernitzan–Kornfeld conjecture. For all r⩾2r\geqslant 2, the set of all infinite type ITM\mathrm{ITM}s on rr intervals is a measure zero subset of ITM(r)\mathrm{ITM}(r). The conjecture asserts that infinite type behavior is rare among interval translation maps; equivalently, finite type should be prevalent in measure for every number of intervals. The source gives no resolution, so the conjecture remains open.

References

Primary source

Kostiantyn Drach, Leon Staresinic and Sebastian van Strien, “Topological Prevalence of Finite Type Interval Translation Maps”, arXiv:2605.00186 (2026).

Additional references

5 papers in this index state this conjecture (2021–2026). The statement above is taken from the most recent of them; the others are arXiv:2605.00173, arXiv:2603.19401, arXiv:2412.07928, arXiv:2102.11803.

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