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

Are formulas with more than 3 quantifiers intentionally excluded? #14

Open
heidelberg1386 opened this issue Apr 6, 2021 · 1 comment

Comments

@heidelberg1386
Copy link

First of all, thanks for your great project.

Given that all lowercase letters other than x, y and z are interpreted as names, it appears to me that proofs with formals with four quantifiers are impossible to express.

Eg Aw Ax Ay Az (Rwxyz) returns "not well formed".

Is there any way to avoid this? If not: I know this exceeds the scope of a github issue, but do you know of any proof checking software (FOL with Identity) that is easy enough to understand in which I can express these formulas?

Best wishes from Germany,
Johannes

@rzach
Copy link
Member

rzach commented Apr 6, 2021

I'm not actually maintaining this since I didn't write it. Maybe @frabjous has an answer.

I now use carnap.io for everything since it can automatically grade student work. It does support arbitrary quantifier blocks. See https://carnap.io/shared/[email protected]/Practice%20Problems%20VII.md (scroll to very end for a box for arbitrary proofs)

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