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The standard (documented) way to make proofs is \[\begin{nd}...\end{nd}\]. There should be a fitchproof environment (like it's defined in forallx that does away with the math mode switch and left-aligns the proof.
The standard (documented) way to make proofs is
\[\begin{nd}...\end{nd}\]. There should be afitchproofenvironment (like it's defined in forallx that does away with the math mode switch and left-aligns the proof.