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math.PR2026
A Formalization of the Ionescu-Tulcea Theorem in Mathlib
Etienne Marion
We describe the formalization of the Ionescu-Tulcea theorem, showing the existence of a probability measure on the space of trajectories of a Markov chain, in the proof assistant L…
math.PR2025
Formalization of Brownian motion in Lean
Rémy Degenne, David Ledvinka, Etienne Marion +1
Brownian motion is a building block in modern probability theory. In this paper, we describe a formalization of Brownian motion using the Lean theorem prover. We build on the exist…