Semimetrizable spaces are Gδ, add explicit proof to S61|P33 #1220
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T699: Very nice result. |
prabau
reviewed
Jan 31, 2025
Co-authored-by: Patrick Rabau <[email protected]>
prabau
approved these changes
Jan 31, 2025
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I have approved this, but I will do a separate PR right now to clean some related things. In particular the description of S61 (pointed irrational extension of the reals) is not quite right. And also Ishikawa's result can be added to the README for countably metacompact. I'll let you review it. |
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See #1221 |
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Since S60|P33 was wrong in the S&S book, I think we should explicitly add the proof of S61|P33 to distinguish them.
Also, semimetrizable spaces ⇒ Gδ is a useful result that can deduce many redundant traits.