Countable + P space => Alexandrov#1776
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The theorem also works with countable replaced by locally countable. |
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thanks |
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May 17, 2026
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| Let $x \in X$, $A$ be the neighborhood kernel of $x$ and, by {P93}, $V$ be a countable open neighborhood of $x$. | ||
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| If $V=A$ we are clearly done. |
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Note this case distinction is actually necessary for
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We need this theorem for P-space =>$\alpha_1$ . (both theorems do not actually give new traits but we should have them for completeness, see this) comment.
This PR has high priority