CWH locally relatively compact Alexandrov T0 spaces are normal - #1827
Open
prabau wants to merge 2 commits into
Open
CWH locally relatively compact Alexandrov T0 spaces are normal#1827prabau wants to merge 2 commits into
prabau wants to merge 2 commits into
Conversation
This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment
Add this suggestion to a batch that can be applied as a single commit.This suggestion is invalid because no changes were made to the code.Suggestions cannot be applied while the pull request is closed.Suggestions cannot be applied while viewing a subset of changes.Only one suggestion per line can be applied in a batch.Add this suggestion to a batch that can be applied as a single commit.Applying suggestions on deleted lines is not supported.You must change the existing code in this line in order to create a valid suggestion.Outdated suggestions cannot be applied.This suggestion has been applied or marked resolved.Suggestions cannot be applied from pending reviews.Suggestions cannot be applied on multi-line comments.Suggestions cannot be applied while the pull request is queued to merge.Suggestion cannot be applied right now. Please check back later.
New T927:
Collectionwise Hausdorff + locally relatively compact + Alexandrov + T0 => normal.One of the contrapositives allows to derive that three more spaces are not CWH:
https://topology.pi-base.org/spaces?q=24%2Balexandrov%2BT0%2B%7Enormal%2B%3FCWH
(I initially added some meta-properties, thinking there would be a version without T0, but that did not work. I left them as it's good to have anyway.)