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superprocess : ウィキペディア英語版
superprocess

An (\alpha,d,\beta)-superprocess, X(t,dx), is a stochastic process on \mathbb \times \mathbb^d that is usually constructed as a special limit of branching diffusion where the branching mechanism is given by its factorial moment generating function:
: \Phi(s) = \frac(1-s)^+s
and the spatial motion of individual particles is given by the \alpha-symmetric stable process with infinitesimal generator
\Delta_.
The \alpha = 2 case corresponds to standard Brownian motion and the (2,d,1)-superprocess is called the Dawson-Watanabe superprocess or super-Brownian motion.
One of the most important properties of superprocesses is that they are intimately connected with certain nonlinear partial differential equations.
The simplest such equation is
:\Delta u-u^2=0\ on\ \mathbb^d.
==References==

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抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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