Title of article :
Normal covers of various products
Author/Authors :
Yajima، نويسنده , , Yukinobu، نويسنده ,
Issue Information :
دوماهنامه با شماره پیاپی سال 2010
Abstract :
Throughout this paper, we consider the following two problems: (A) When does a rectangular normal cover of a product X × Y (or an infinite product ∏ λ ∈ Λ X λ ) have a σ-locally finite rectangular cozero refinement? (B) What kind of a refinement makes a rectangular open cover of a product X × Y (or an infinite product ∏ λ ∈ Λ X λ ) be normal? We shall discuss these problems on various products listed below.
Keywords :
Normal cover , Rectangular product , Rectangular cover , Subspace of an ordinal , Monotonically normal , ?-space , Cylindrical product , Strong ?-space , ?-space , Semi-stratifiable
Journal title :
Topology and its Applications
Journal title :
Topology and its Applications
