Skip to content
New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Stronger systems #4

Open
Convindix opened this issue Apr 10, 2024 · 1 comment
Open

Stronger systems #4

Convindix opened this issue Apr 10, 2024 · 1 comment

Comments

@Convindix
Copy link
Contributor

Convindix commented Apr 10, 2024

I would like to include results for stronger systems in a pull request (e.g. equivalences to Pi^1_1-CA_0).

RT appears to be the strongest system currently here (according to this output of rmzoo), and RT is itself below ATR in strength (Patey, "The reverse mathematics of Ramsey-type theorems", p.28), so it appears that all theories here currently are below ATR. Is there a guideline against adding theories stronger than RT or ATR to rmzoo (e.g. if the focus is on the detail of the hierarchy around RCA through ACA), or is it allowed?

The Contributing guidelines page contains the following quote:

For example, if anyone wants to transcribe the relevant results of Simpson’s SOSOA into our format, the maintainers would be eternally grateful!

If there is a guideline against adding theories stronger than RT, should the results from SOSOA be cut off to only include theories weaker than ATR?

@ericastor
Copy link
Owner

It's been a while since this repository has been very active... but I have no objection to extending up to stronger systems!

My interest was originally focused more on results below ATR, but that was just a personal focus, along with the fact that I never got the time to transcribe very much of SOSOA... which seemed pretty important before adding many stronger theorems.

Sign up for free to join this conversation on GitHub. Already have an account? Sign in to comment
Labels
None yet
Projects
None yet
Development

No branches or pull requests

2 participants