Weak compatibility conjecture for weighted Hardy-field averages

Let H\mathcal{H} be a Hardy field, let f1,,fk,WHf_1,\ldots,f_k,W\in\mathcal{H}, and define

span(f1,,fk)={c1f1(t)++ckfk(t):(c1,,ck)Rk\{0}}.\operatorname{span}^*(f_1,\ldots,f_k)=\{c_1f_1(t)+\cdots+c_kf_k(t):(c_1,\ldots,c_k)\in\mathbb{R}^k\backslash\{0\}\}.

Property (WP) is that, for every fspan(f1,,fk)f\in\operatorname{span}^*(f_1,\ldots,f_k) and pR[t]p\in\mathbb{R}[t], either f(t)p(t)1|f(t)-p(t)|\ll1 or f(t)p(t)log(W(t))|f(t)-p(t)|\succ\log(W(t)). Weak compatibility conjecture. Theorem main holds if its Property P is replaced by Property (WP). This would extend the paper's weighted convergence and recurrence theorem under a weaker separation condition; the source presents the implication as a conjecture and gives no resolution.

Sources & referencesView supporting material

Primary source

Vitaly Bergelson, Joel Moreira and Florian K. Richter, “Multiple ergodic averages along functions from a Hardy field: convergence, recurrence and combinatorial applications”, arXiv:2006.03558 (2026).

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