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korrents.com
Formalising a proof in Lean currently takes about ten times the effort of writing it out: doable, but annoying.Their words
So right now I estimate that the time and effort taken to formalize it, proof is about 10 times the amount taken to write it out. So it's doable, but it's annoying.
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Terence Tao Mastodon
While working on the revision of the Equational Theories Project (ETP) report at https://arxiv.org/abs/2512.07087 I came across an observation that we quietly made at the back of that report (see Section 14.1) but has become more relevant today. The ETP was a successful project, running over several months, to resolve over 22 million implications in universal algebra (and formalize them in Lean) through a variety of methods, both human and automated, although in our case the automation was much more in the ``good old-fashioned'' form of utilizing automated theorem provers (ATP) and simple scr…
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