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3 new alpha1 theorems#1781

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prabau merged 6 commits into
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alphacountable
May 23, 2026
Merged

3 new alpha1 theorems#1781
prabau merged 6 commits into
mainfrom
alphacountable

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@felixpernegger
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@felixpernegger felixpernegger commented May 19, 2026

(I know I said I wouldnt open new PRs for now, but I really like the results here.)

This implements the missing theorems from this comment.

This gives two more traits, but very plausible many more (since for 14/17 remaining spaces either W-space, P-space or well based is still unknown).

We cant use explore to refer the the theorems used in the proof, otherwise the explore will just refer to the theorem itself, I tested this.
(Except for some reason for the third one it works as intended; to keep consistent and more stable to potential changes to pibase, lets keep it like it is however)

This PR has medium priority!

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felixpernegger commented May 19, 2026

I want to emphasise, that we have had great progress on the alpha_i properties. When I joined in November, there was pretty much only First countable => alpha_1, but now we are getting very close to actually completing the properties. (Despite still having no nonterminal pi-base theorems about them!) :)

Comment thread theorems/T000895.md Outdated
Co-authored-by: Patrick Rabau <70125716+prabau@users.noreply.github.com>
Comment thread theorems/T000896.md Outdated
Comment thread theorems/T000895.md Outdated
Comment thread theorems/T000897.md Outdated
felixpernegger and others added 3 commits May 22, 2026 08:24
Co-authored-by: Patrick Rabau <70125716+prabau@users.noreply.github.com>
Co-authored-by: Patrick Rabau <70125716+prabau@users.noreply.github.com>
Co-authored-by: Patrick Rabau <70125716+prabau@users.noreply.github.com>
@prabau prabau merged commit a96ec96 into main May 23, 2026
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@prabau prabau deleted the alphacountable branch May 23, 2026 05:25
felixpernegger added a commit that referenced this pull request May 24, 2026
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