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penalizing negative skewness by linking $U(\mu)$ and $U(\Sigma)$
Consider $U_1(\mu,\Sigma)$ and $U_2(\mu,\Sigma)$, where $U_1(\mu, \cdot) = U_2(\mu, \cdot)$, $U_1(\cdot, \Sigma) = U_2(\cdot, \Sigma)$ such that
\begin{equation*}
arg\inf\limits_{\mu \in U_1(\mu, ...
