A model in which countable Fréchet α<sub>1</sub>-spaces are first countable (Q3032982)
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| Language | Label | Description | Also known as |
|---|---|---|---|
| English | A model in which countable Fréchet α<sub>1</sub>-spaces are first countable |
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A model in which countable Fréchet α<sub>1</sub>-spaces are first countable (English)
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1989
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countable Fréchet \(\alpha _ 1\)-spaces
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rational perfect set forcing
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Cohen reals
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model of set theory
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