Are We Stuck with Lean?
Summary
A MathOverflow discussion about whether the Lean proof assistant is essentially the default and if there could be a viable institutional alternative (e.g., Metamath). The thread explores sociotechnical factors, soundness concerns, ecosystem maturity, and the role of libraries like Mathlib in Lean’s adoption, with perspectives ranging from staunch defense of Lean to cautious optimism for alternatives such as Metamath, Rocq, Mizar, and Isabelle.