2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/110187This is a survey note of the author's observations on the discrete-time analogues of Itô formulas.Based on a talk given at the 7th Workshop on Stochastic Numerics; Jun 27--29, 2005, RIMS, KyotoProbability60-02, 60-06, 65-C30Discrete Itô Formulas and Their Applications to Stochastic Numericstext