How did you open it? Sometimes you can't just double click but have to right-click the app and choose "Open" in the menu, and then again "Open" in the confirmation dialog. I think this is only needed once and then it works normally. Unfortunately I don't have access to a Mac anymore so I can't verify.
Do you mean essentially like a custom "rule" (lemma) which you could then use like an ordinary rule wherever it fits? So basically a kind of template instead of a plain copy.
No, this is propositional logic only. I have plans for adding first order logic (likely as a separate game as it would probably need some bigger UI changes) too but haven't had time to do it yet
Thanks! Yeah, such a function could be useful in some places but I think in *most* cases you can find a shorter sub-proof so that it's easy to copy manually ;) I'll keep it in mind for a possible future extension/v2 though!
You're right, I even had it at some point but decided to remove it to simplify the UI since not many levels seemed to need it. But you're not the first one to comment about it so maybe I was wrong...
Thanks for the comment! I indeed dropped equivalence (<->) because I thought it would clutter the UI without bringing interesting new mechanics. Maybe I'll include it in a future version, though. I'll also add your proof suggestions to a list of possible future additions!
Hi! I just released my first solo game Deductum, where you prove logical claims by building proof trees. If you are like me and actually enjoyed your math homework, then this might be for you!
