MathFin
Formally verified mathematical finance in Lean 4. Black–Scholes/Greeks/PDE, Itô calculus, FTAP/Girsanov, CRR→BS convergence, Merton jump-diffusion.
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mathlib
v4.31.0The math library of Lean 4BrownianMotion
d6f23daConstruction of a Brownian Motion in LeanLeanArchitect
v4.30.0LeanArchitect extracts a blueprint directly from Lean source.