Jointly scattered derivative conjecture for analytic compositions

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Let I⊂RI\subset\mathbb{R} be a compact interval and let k∈Nk\in\mathbb{N}. For each i=1,…,ki=1,\dots,k, let (ui,n)n∈N(u_{i,n})_{n\in\mathbb{N}} be a sequence of functions in C1(I,R)C^1(I,\mathbb{R}) whose derivatives ui,n′u_{i,n}' are monotone for every ii and nn. Let f1,…,fk:R→Rf_1,\dots,f_k:\mathbb{R}\to\mathbb{R} be analytic functions, and assume that for every a∈Ra\in\mathbb{R} the sequences u1,n′(a),…,uk,n′(a)u_{1,n}'(a),\dots,u_{k,n}'(a) are jointly scattered. Jointly scattered derivative conjecture. For almost every x∈Rx\in\mathbb{R}, the sequence

(u1,n(f1(x)),…,uk,n(fk(x)))n∈N\big(u_{1,n}(f_1(x)),\dots,u_{k,n}(f_k(x))\big)_{n\in\mathbb{N}}

is uniformly distributed in Tk\mathbb{T}^k. This is the second proposed way to avoid the counterexample in the preceding discussion; the paper gives no resolution.

References

Primary source

Vitaly Bergelson and Joel Moreira, “Metric uniform distribution on analytic curves”, arXiv:2509.06909 (2025).

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