Brownian representations of cylindrical continuous local martingales
Abstract
In this paper we give necessary and sufficient conditions for a cylindrical continuous local martingale to be the stochastic integral with respect to a cylindrical Brownian motion. In particular we consider the class of cylindrical martingales with closed operator-generated covariations. We also prove that for every cylindrical continuous local martingale M there exists a time change τ such that M τ is Brownian representable.
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