This is delightful.
I wonder if it would be feasible to pose other challenges. For example, constructing the real numbers - with all the set theory, rational numbers, etc, assumed but starting with http://us.metamath.org/mpeuni/df-np.html and with success being achieved when all of the axioms at http://us.metamath.org/mpeuni/mmcomplex.html are proved - need not be via the same intermediate theorems. Perhaps that is too hard.
As for mmj2, proof writing itself is plenty fast, but at least
the way I use it there is some copy pasting and other fiddling
that I do - which perhaps I could just relearn a different way for
speedruns.
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