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Let $H \subset E$ be the Cameron-Martin space of a Gaussian measure $\mu$ on a separable Banach space $E$. The Cameron-Martin theorem states that for all $h \in E$ we have $h \in H$ if and only if $\mu(\cdot + h)$ is equivalent to $\mu$, and then the Radon-Nikodym derivative is
$$
\frac{d\mu(\cdo...