$$\def\ep{\epsilon}
\def\f{\frac}
\def\df{\dfrac}
\def\p{\partial}
\def\grad{\nabla}
\newcommand{\abs}[1]{ \left| #1 \right|}
\newcommand{\norm}[1]{\big\lVert#1\big\rVert}
\newcommand{\inner}[2]{\langle #1, #2 \rangle}
$$
All articles published at September, 2013