Contrast a strong vs weak solution of a stochastic differential equation

Math
Differential-Equations
Stochastic-Differential-Equations
Author

Galen Seilis

Published

July 24, 2021

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Question

I think I am getting confused by the very similar wording on Wikipedia: “A weak solution consists of a probability space and a process that satisfies the integral equation, while a strong solution is a process that satisfies the equation and is defined on a given probability space.”

Let’s say we have a probability space \((\Omega, \mathcal{F}, P)\) and a stochastic differential equation \(dX_t = \langle\text{Stochastic Differential Expression}\rangle\), with some integral equation \(X_{t+s} - X_{s} = \langle\text{Stochastic Integral Expression}\rangle\) where \(t \geq 0\), and \(s \geq 0\). What precisely are we saying about a solution when it is ‘strong’ vs ‘weak’?