Title of article :
An α4 , not Fréchet product of α4 Fréchet spaces
Author/Authors :
Costantini، نويسنده , , Camillo and Simon، نويسنده , , Petr، نويسنده ,
Issue Information :
دوماهنامه با شماره پیاپی سال 2000
Abstract :
We shall construct in ZFC two Fréchet–Urysohn α4 -spaces, the product of which is α4 , but fails to be Fréchet–Urysohn. This answers Noguraʹs question from 1985.
Keywords :
Fréchet–Urysohn space , ?4 -space , Almost disjoint family , Convergent sequence
Journal title :
Topology and its Applications
Journal title :
Topology and its Applications
