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\renewcommand{\t}{\mathsf T}
\newcommand{\conv}{*}
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\newcommand{\correlation}[1]{\left< #1 \right>}
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% \newcommand{\dummy}{\mathord{\color{black!33}\bullet}}%
\newcommand{\eip}[2]{\left\langle\left\langle{#1,#2}\right\rangle\right\rangle}
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\newcommand{\iip}[2]{(\!(#1, #2)\!)}
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\newcommand{\operator}[0]{\mathcal}
\newcommand{\orth}[1]{#1^\perp}
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% \newcommand{\proj}[2]{\pi\left(#1,#2\right)}
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% Cahn-Hilliard
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