Basically, I was reading the comments to Equivalence of Deductive System $L_0$ and the Sequent Calculus and Mauro says that PC is A3 in sequent form. I don't quite understand this. Can someone please explain me how can PC be deduced from $L_0$?
2026-02-23 10:22:52.1771842172
Prove "proof by contradiction" from $L_0$
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