What is mean by: $X_Y(t)$ satisfies the stochastic differential equation $$ dX_Y(t) = \sigma X_Y(t) dW(t). $$ What is definition of $dX_Y(t)$ and $dW(t)$?
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Have you at least looked at this ? – Kurt G. Sep 11 '22 at 17:30
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yes, but they use the notation without explanation – franta96 Sep 11 '22 at 17:37
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They don't. The Wikipedia article refers you further to Ito calculus. Learning that is doable but not just a matter of explaining notation. – Kurt G. Sep 11 '22 at 17:41