Overview: In the mathematical treatment of many problems which arise inphysics, economics, engineering, management, etc., the researcherfrequently faces two major difficulties: infinite dimensionality andrandomness of the evolution process. Infinite dimensionality occurswhen the evolution in time of a process is accompanied by a space-likedependence; for example, spatial distribution of the temperature for aheat-conductor, spatial dependence of the time-varying displacement ofa membrane subject to external forces, etc. Randomness is intrinsic tothe mathematical formulation of many phenomena, s
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