On Fσ-δ-normality and hereditary δ-norma
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A.P. Kombarov
📂
Article
📅
1999
🏛
Elsevier Science
🌐
English
⚖ 404 KB
It is proved that if all Fg-sets in the product X x Y are &normal, then either X is normal and countably paracompact or all countable subsets of Y are closed. If the product X x Y is hereditarily S-normal, then either X is perfectly normal or all countable subsets of Y are closed. Applications to ex