English

Uniform Distribution of Sequences and its interplay with Functional Analysis

Functional Analysis 2023-05-23 v2 Classical Analysis and ODEs Number Theory

Abstract

In this paper we apply ideas from the theory of Uniform Distribution of sequences to Functional Analysis and then drawing inspiration from the consequent results, we study concepts and results in Uniform Distribution itself. So let EE be a Banach space. Then we prove:\\ (a) If FF is a bounded subset of EE and x\co(F)x \in \overline{\co}(F) (= the closed convex hull of FF), then there is a sequence (xn)F(x_n) \subseteq F which is Ces\`{a}ro summable to xx.\\ (b) If EE is separable, FEF \subseteq E^* bounded and f\cow(F)f \in \overline{\co}^{w^*}(F), then there is a sequence (fn)F(f_n) \subseteq F whose sequence of arithmetic means f1++fNN\frac{f_1+\dots+f_N}{N}, N1N \ge 1 weak^*-converges to ff. By the aid of the Krein-Milman theorem, both (a) and (b) have interesting implications for closed, convex and bounded subsets Ω\Omega of EE such that Ω=\co(\exΩ)\Omega=\overline{\co}(\ex \Omega) and for weak^* compact and convex subsets of EE^*. Of particular interest is the case when Ω=BC(K)\Omega=B_{C(K)^*}, where KK is a compact metric space. By further expanding the previous ideas and results, we are able to generalize a classical theorem of Uniform Distribution which is valid for increasing functions φ:I=[0,1]R\varphi:I=[0,1] \rightarrow \mathbb{R} with φ(0)=0\varphi(0)=0 and φ(1)=1\varphi(1)=1, for functions φ\varphi of bounded variation on II with φ(0)=0\varphi(0)=0 and total variation V01φ=1V_0^1 \varphi=1.

Keywords

Cite

@article{arxiv.2102.02306,
  title  = {Uniform Distribution of Sequences and its interplay with Functional Analysis},
  author = {S. K. Mercourakis and G. Vassiliadis},
  journal= {arXiv preprint arXiv:2102.02306},
  year   = {2023}
}
R2 v1 2026-06-23T22:48:58.983Z