Hyers-Ulam (HU) Stability and Mittag-Leffler-HU Stability of Additive Brownian Motion (Louis Bachelier's Model)S. Sankar, P. Pushpa and A. Ponmana SelvanEPJ Web Conf., 363 (2026) 03002DOI: https://doi.org/10.1051/epjconf/202636303002