\subsection{abs}
\label{lababs}
\noindent Name: \textbf{abs}\\
\phantom{aaa}the absolute value.\\[0.2cm]
\noindent Library names:\\
\verb|   sollya_obj_t sollya_lib_abs(sollya_obj_t)|\\
\verb|   sollya_obj_t sollya_lib_build_function_abs(sollya_obj_t)|\\
\verb|   #define SOLLYA_ABS(x) sollya_lib_build_function_abs(x)|\\[0.2cm]
\noindent Description: \begin{itemize}

\item \textbf{abs} is the absolute value function. \textbf{abs}(x)=$\left \lbrace \begin{array}{rl} x & x > 0 \\ -x & x \leq 0 \end{array}  \right.$.
\end{itemize}
