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Flow of diffeomorphisms induced by a geometric multiplicative functional. (English) Zbl 0918.60009
The paper describes a new approach for constructing a stochastic flow of diffeomorphisms. The authors prove that the unique multiplicative functional solution to a differential equation driven by a geometric multiplicative functional constitutes a flow of local diffeomorphisms. A geometric multiplicative functional is constructed using Lyons forms [see T. Lyons, Math. Res. Lett. 1, No 4, 451-464 (1994; Zbl 0835.34004)]. If the driving path is a Brownian motion (or more generally, a continuous semimartingale), the result in particular gives the answer to an open problem proposed by N. Ikeda and S. Watanabe [“Stochastic differential equations and diffusion processes” (1981; Zbl 0495.60005)].
Reviewer: V.Oganyan (Erevan)

60D05 Geometric probability and stochastic geometry
58D25 Equations in function spaces; evolution equations
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