Main conjecture on the recursive structure of fusible numbers

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Let F{\mathcal{F}} be the set of fusible numbers. For a∈Fa\in{\mathcal{F}}, let s(a)s(a) be its successor, let m(a)m(a) denote the relevant minimum gap, and write

[a‾,s(a)‾)=⋃n∈N+Ia,n[\overline{a},\overline{s(a)})=\bigcup_{n\in\mathbb{N}^+}\mathcal{I}_{a,n}

as before. Main conjecture. For every a∈Fa\in{\mathcal{F}} and every n∈N+n\in\mathbb{N}^+, the fusible numbers in Ia,n\mathcal{I}_{a,n} can be written as sn(a)∼cs^n(a)\sim c for some c∈Fc\in{\mathcal{F}}. Equivalently, Ia,n∩F\mathcal{I}_{a,n}\cap{\mathcal{F}} is a translated copy of

[a‾−21−nm(a),a‾)∩F[\overline{a}-2^{1-n}m(a),\overline{a})\cap{\mathcal{F}}

scaled by a factor of 1/21/2. This conjecture proposes a self-similar description of the fusible numbers in the intervals between a number and its successor, following the failure of the earlier formula for all fusible numbers; the source provides no proof or resolution.

References

Primary source

Junyan Xu, “Survey on fusible numbers”, arXiv:1202.5614 (2012).

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