Maybe it's trivial but why can we write this integral as the sum of these two integrals? We use Fubini Theorem but I don't understand why there are such limits on the right hand side.
2026-04-07 11:04:34.1775559874
Why $\int_t^T \int_0^s f(s,u)dW(u)ds=\int_0^t \int_t^T f(s,u)dsdW(u)+\int_t^T \int_u^Tf(s,u)dsdW(u)$??
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