1. Faculty of Mechanics and Mathematics, Kyiv National Taras Shevchenko University, Volodymyrska 64, 01601, Kyiv, Ukraine 2. Economics Faculty, Kyiv National Taras Shevchenko University, Volodymyrska 64, 01601, Kyiv, Ukraine
Abstract:
We study the problem of optimal approximation of a fractional Brownian motion by martingales. We prove that there exists a unique martingale closest to fractional Brownian motion in a specific sense. It shown that this martingale has a specific form. Numerical results concerning the approximation problem are given.