English

Small Banach bundles and modules

Functional Analysis 2024-06-04 v2 General Topology Operator Algebras

Abstract

We characterize those (continuously-normed) Banach bundles EX\mathcal{E}\to X with compact Hausdorff base whose spaces Γ(E)\Gamma(\mathcal{E}) of global continuous sections are topologically finitely-generated over the function algebra C(X)C(X), answering a question of I. Gogi\'c's and extending analogous work for metrizable XX. Conditions equivalent to topological finite generation include: (a) the requirement that E\mathcal{E} be locally trivial and of finite type along locally closed and relatively FσF_{\sigma} strata in a finite stratification of XX; (b) the decomposability of arbitrary elements in p(Γ(E))\ell^p(\Gamma(\mathcal{E})), 1p<1\le p<\infty as sums of N\le N products in p(C(X))Γ(E)\ell^p(C(X))\cdot \Gamma(\mathcal{E}) for some fixed NN; (c) the analogous decomposability requirement for maximal Banach-module tensor products F^C(X)Γ(E)F\widehat{\otimes}_{C(X)}\Gamma(\mathcal{E}) or (d) equivalently, only for F=1(C(X))F=\ell^1(C(X)).

Keywords

Cite

@article{arxiv.2405.14518,
  title  = {Small Banach bundles and modules},
  author = {Alexandru Chirvasitu},
  journal= {arXiv preprint arXiv:2405.14518},
  year   = {2024}
}

Comments

v2 corrects minor typos; 12 pages + references

R2 v1 2026-06-28T16:37:11.638Z