3 search results - page 1 / 1 » Disjoint Unions of Topological Spaces and Choice |
MLQ
1998
13 years 10 months ago
1998
We find properties of topological spaces which are not shared by disjoint unions in the absence of some form of the Axiom of Choice.
MLQ
1998
13 years 10 months ago
1998
Abstract. We investigate the set theoretical strength of some properties of normality, including Urysohn’s Lemma, Tietze-Urysohn Extension Theorem, normality of disjoint unions o...
CCA
2009
Springer
14 years 5 months ago
2009
Springer
Abstract. In this paper we study a reducibility that has been introduced by Klaus Weihrauch or, more precisely, a natural extension of this reducibility for multi-valued functions ...