+
+\newcommand {\tv}[1] {\lVert #1 \rVert_{\rm TV}}
+\def \top {1.8}
+\def \topt {2.3}
+\def \P {\mathbb{P}}
+\def \ov {\overline}
+\def \ts {\tau_{\rm stop}}
+\def\rl{{^{.}}}
+
+\DeclarePairedDelimiter\abs{\lvert}{\rvert}%
+\DeclarePairedDelimiter\norm{\lVert}{\rVert}%
+
+% Swap the definition of \abs* and \norm*, so that \abs
+% and \norm resizes the size of the brackets, and the
+% starred version does not.
+\makeatletter
+\let\oldabs\abs
+\def\abs{\@ifstar{\oldabs}{\oldabs*}}
+%
+\let\oldnorm\norm
+\def\norm{\@ifstar{\oldnorm}{\oldnorm*}}
+\makeatother
+