\newcommand{\half}{\frac{1}{2}}
\newcommand{\tp}{\thinspace .}

\newcommand{\xpoint}{\bm{x}}
\newcommand{\normalvec}{\bm{n}}
\newcommand{\Oof}[1]{\mathcal{O}(#1)}

% Boldface vectors/tensors
\newcommand{\x}{\bm{x}}
\renewcommand{\v}{\bm{v}}
\newcommand{\rpos}{\bm{r}}
% Unit vectors
\newcommand{\ii}{\bm{i}}
\newcommand{\jj}{\bm{j}}
\newcommand{\kk}{\bm{k}}
\newcommand{\ir}{\bm{i}_r}
\newcommand{\ith}{\bm{i}_{\theta}}
\newcommand{\iz}{\bm{i}_z}
