English

Ordered field valued continuous functions with countable range

General Topology 2021-11-24 v1

Abstract

For a Hausdorff zero-dimensional topological space XX and a totally ordered field FF with interval topology, let Cc(X,F)C_c(X,F) be the ring of all FF-valued continuous functions on XX with countable range. It is proved that if FF is either an uncountable field or countable subfield of R\mathbb{R}, then the structure space of Cc(X,F)C_c(X,F) is β0X\beta_0X, the Banaschewski Compactification of XX. The ideals {Ocp,F:pβ0X}\{O^{p,F}_c:p\in \beta_0X\} in Cc(X,F)C_c(X,F) are introduced as modified countable analogue of the ideals {Op:pβX}\{O^p:p\in\beta X\} in C(X)C(X). It is realized that Cc(X,F)CK(X,F)=pβ0X\XOcp,FC_c(X,F)\cap C_K(X,F)=\bigcap_{p\in\beta_0X\texttt{\textbackslash}X} O^{p,F}_c, this may be called a countable analogue of the well-known formula CK(X)=pβX\XOpC_K(X)=\bigcap_{p\in\beta X\texttt{\textbackslash}X}O^p in C(X)C(X). Furthermore, it is shown that the hypothesis Cc(X,F)C_c(X,F) is a Von-Neumann regular ring is equivalent to amongst others the condition that XX is a PP-space.

Keywords

Cite

@article{arxiv.2007.05206,
  title  = {Ordered field valued continuous functions with countable range},
  author = {Sudip Kumar Acharyya and Atasi Deb Ray and Pratip Nandi},
  journal= {arXiv preprint arXiv:2007.05206},
  year   = {2021}
}