Affiliation:
1. Department of Mathematical Sciences, Yazd University, Yazd, Iran
Abstract
Let X be a nonempty topological space, C(X)F be the set of all real-valued
functions on X which are discontinuous at most on a finite set and B1(X) be
the ring of all real-valued Baire one functions on X. We show that any
member of B1(X) is a zero divisor or a unit. We give an algebraic
characterization of X when for every p ? X, there exists f ? B1(X) such that
{p} = f ?1(0) and we give some topological characterizations of minimal
ideals, essential ideals and socle of B1(X). Some relations between C(X)F,
B1(X) and some interesting function rings on X are studied and investigated.
We show that B1(X) is a regular ring if and only if every countable
intersection of cozero sets of continuous functions can be represented as a
countable union of zero sets of continuous functions.
Publisher
National Library of Serbia
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