::: {.content-visible when-format="html"}
::: {.hidden}
$$
\newcommand{\mY}{\mathbf{Y}}
\newcommand{\mZ}{\mathbf{Z}}
\newcommand{\mX}{\mathbf{X}}
\newcommand{\mU}{\mathbf{U}}
\newcommand{\mV}{\mathbf{V}}
\newcommand{\mD}{\mathbf{D}}
\newcommand{\vg}{\boldsymbol{\gamma}}
\newcommand{\vd}{\boldsymbol{\delta}}
\newcommand{\ybar}{\bar{y}}
\newcommand{\vgs}{\mathbf{g}}
\newcommand{\ves}{\mathbf{e}}
\newcommand{\va}{\mathbf{a}}
\newcommand{\vx}{\mathbf{x}}
$$
:::
:::
