TY - JOUR
AU - Acharyya, Amrita
AU - Acharyya, Sudip Kumar
AU - Bag, Sagarmoy
AU - Sack, Joshua
PY - 2021/04/01
Y2 - 2022/11/30
TI - Intermediate rings of complex-valued continuous functions
JF - Applied General Topology
JA - Appl. Gen. Topol.
VL - 22
IS - 1
SE -
DO - 10.4995/agt.2021.13165
UR - http://ojs.upv.es/index.php/AGT/article/view/13165
SP - 47-65
AB - <p>For a completely regular Hausdorff topological space X, let C(X, C) be the ring of complex-valued continuous functions on X, let C âˆ— (X, C) be its subring of bounded functions, and let Σ(X, C) denote the collection of all the rings that lie between C âˆ— (X, C) and C(X, C). We show that there is a natural correlation between the absolutely convex ideals/ prime ideals/maximal ideals/z-ideals/z â—¦ -ideals in the rings P(X, C) in Σ(X, C) and in their real-valued counterparts P(X, C) âˆ© C(X). These correlations culminate to the fact that the structure space of any such P(X, C) is βX. For any ideal I in C(X, C), we observe that C âˆ— (X, C)+I is a member of Σ(X, C), which is further isomorphic to a ring of the type C(Y, C). Incidentally these are the only C-type intermediate rings in Σ(X, C) if and only if X is pseudocompact. We show that for any maximal ideal M in C(X, C), C(X, C)/M is an algebraically closed field, which is furthermore the algebraic closure of C(X)/M âˆ©C(X). We give a necessary and sufficient condition for the ideal CP (X, C) of C(X, C), which consists of all those functions whose support lie on an ideal P of closed sets in X, to be a prime ideal, and we examine a few special cases thereafter. At the end of the article, we find estimates for a few standard parameters concerning the zero-divisor graphs of a P(X, C) in Σ(X, C).</p>
ER -