Open teorth opened 2 hours ago
Discussed at https://leanprover.zulipchat.com/#narrow/stream/458659-Equational/topic/Equations.2Elean.20vs.20Chapter.202
claim
Discussed at https://leanprover.zulipchat.com/#narrow/stream/458659-Equational/topic/Equations.2Elean.20vs.20Chapter.202