Graded commutativity of cup product #938
Merged
Conversation
This file contains 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
mortberg
requested changes
Sep 29, 2022
|
@mortberg should be done now |
mortberg
approved these changes
Oct 7, 2022
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Outdated suggestions cannot be applied.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.
This PR contains graded commutativity for the various versions of the cup product in the library. The main result (or, at least, the most general one) is the final theorem in
Homotopy.EilenbergMacLane.GradedCommTensor. The proof itself is (beautiful in theory but in practice) a massive mess of transports and congs. It should be read by no one.This means some ad hoc solutions in Cohomology/Rings can be removed, but I'll leave this for a future PR.