Weaker sufficient estimate for systems satisfying condition (d)

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Let {fi}i=1n\{f_i\}_{i=1}^n be a system of functions satisfying condition (d) with parameter p∈[0,1/2)p\in[0,1/2). For each fixed x∈Xx\in X, let fk∗(x)f_k^*(x) denote the decreasingly ordered values among ∣fj(x)∣|f_j(x)|. Weaker sufficient-estimate conjecture. There exist constants ε0∈(0,1/2)\varepsilon_0\in(0,1/2) and L>0L>0 such that

∫X∑1≤k≤n1/2+εfk∗(x) dμ(x)≤const⁡⋅np+Lε\int_X\sum_{1\le k\le n^{1/2+\varepsilon}}f_k^*(x)\,d\mu(x)\le \operatorname{const}\cdot n^{p+L\varepsilon}

whenever ε∈(0,ε0)\varepsilon\in(0,\varepsilon_0). The paper presents this estimate as a weaker statement whose proof would imply a weaker form of the preceding generalization conjecture; no proof or resolution is supplied here.

References

Primary source

Pavel Grigoriev, “Random linear combinations of functions from L_1”, arXiv:math/0210341 (2002).

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