descriptive claim
Lean can verify proofs but cannot determine whether definitions are correct, since definitions are stipulations rather than logically true or false statements.
Unresolved speaker · Mathematics Just Changed Forever — Kevin Hartnett · 26 Oct 2026
In their words
The transcript segments this claim was taken from
“Lean could verify proofs, but it couldn't check definitions because, logically speaking, definitions aren't right or wrong. They're just what you say they are.”1:16:12Report a misattribution
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