@Article{Boutabia2013, author = "Boutabia, Hacène and Grabsia, Imen", title = "Chaotic expansion in the G-expectation space", journal = "Opuscula Math.", year = "2013", volume = "33", number = "4", pages = "647--666", doi = "http://dx.doi.org/10.7494/OpMath.2013.33.4.647", url = "http://dx.doi.org/10.7494/OpMath.2013.33.4.647", abstract = "In this paper, we are motivated by uncertainty problems in volatility. We prove the equivalent theorem of Wiener chaos with respect to \(G\)-Brownian motion in the framework of a sublinear expectation space. Moreover, we establish some relationship between Hermite polynomials and \(G\)-stochastic multiple integrals. An equivalent of the orthogonality of Wiener chaos was found.", keywords = "\(G\)-expectation, \(G\)-Brownian motion, \(G\)-multiple integrals, Hermite polynomials, \(G\)-Wiener chaos", issn = "1232-9274" }