Noperthedron
The Noperthedron does not have Rupert Property: a proof in Lean4
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tryAtEachStep
fbab048Try a tactic at each step in a Lean proof.checkdecls
lean4.18.0Tiny Lean library to check existence of declarationsdoc-gen4
v4.28.0Document Generator for Lean 4mathlib
v4.28.0The math library of Lean 4