2017
DOI: 10.2298/fil1719021d
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Addendum to: On a simultaneous generalization of β-normality and almost normality

Abstract: In [1], the authors prove that almost β-normality is preserved by continuous, open, closed surjections. We present examples to show that neither "open" nor "closed" can be omitted.

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“…But Y is vacuously relative almost normal as there does not exist any pair of disjoint regularly closed sets in X. Definition 5 (see [16,17]). X is said to be almost β-normal if for any two disjoint closed subsets A and B of X such that A is regularly closed, there exist open subsets U and V of X such that A ∩ U is dense in A and B ∩ V is dense in B and U ∩ V � ϕ.…”
Section: Theorem 9 If Y Is Relative Almost Normal and Relative T 1 Then Y Is Relative Almost Regularmentioning
confidence: 99%
“…But Y is vacuously relative almost normal as there does not exist any pair of disjoint regularly closed sets in X. Definition 5 (see [16,17]). X is said to be almost β-normal if for any two disjoint closed subsets A and B of X such that A is regularly closed, there exist open subsets U and V of X such that A ∩ U is dense in A and B ∩ V is dense in B and U ∩ V � ϕ.…”
Section: Theorem 9 If Y Is Relative Almost Normal and Relative T 1 Then Y Is Relative Almost Regularmentioning
confidence: 99%