For a document on bussproofs for Gentzen-style proofs, two Fitch-style packages, and also mentioning Lemmon style proofs, see Proofs in LaTeX (Alex Kocurek 2019). Natural deduction and sequent proofs, Gentzen-style The standard package in recent years has been bussproofs.sty (Sam Buss: download the latest version, 1.1, June 2011). Note that there is a LaTeX for Logicians User Guide to bussproofs.s