What is a first countable space?
The definition of first countable space is standard and its meaning is very clear. But is that the case in the absence of the Axiom of Choice? The answer is negative because there are at least three choice-free versions of first countability. And, most likely, the usual definition does not correspon...
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| Formato: | article |
| Idioma: | eng |
| Publicado em: |
2006
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| Texto completo: | http://hdl.handle.net/10316/4609 |
| País: | Portugal |
| Oai: | oai:estudogeral.sib.uc.pt:10316/4609 |