학술저널
MINIMAL QUASI-F COVERS OF SOME EXTENSION
- 충청수학회
- Journal of the Chungcheong Mathematical Society
- Volume 26, No. 2
-
2013.05427 - 433 (7 pages)
- 2
Observing that every Tychono？？ space X has an exten- sion kX which is a weakly LindelÄof space and the minimal quasi-F cover QF(kX) of kX is a weakly LindelÄof, we show that ©kX : QF(kX) ! kX is a z#-irreducible map and that QF(¯X) =¯QF(kX). Using these, we prove that QF(kX) = kQF(X) if and only if ©k X : kQF(X) ! kX is an onto map and ¯QF(X) =QF(¯X).
1. Introduction
2. Quasi-F covers
3. Minimal quasi-F covers of kX
(0)
(0)