descriptive claim
Around 2018, Leo worked on building Lean 4 while mathematical activity and Mathlib development continued at pace.
Unresolved speaker · Mathematics Just Changed Forever — Kevin Hartnett · 26 Oct 2026
In their words
The transcript segments this claim was taken from
“There was this experience I had reporting it where for a period around 2018, Leo goes off and builds Lean 4 and simultaneously all the math activity and math lib is still c- continuing at pace.”1:29:27Report a misattribution
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