\subsection{log2}
\label{lablog2}
\noindent Name: \textbf{log2}\\
\phantom{aaa}binary logarithm.\\[0.2cm]
\noindent Library names:\\
\verb|   sollya_obj_t sollya_lib_log2(sollya_obj_t)|\\
\verb|   sollya_obj_t sollya_lib_build_function_log2(sollya_obj_t)|\\
\verb|   #define SOLLYA_LOG2(x) sollya_lib_build_function_log2(x)|\\[0.2cm]
\noindent Description: \begin{itemize}

\item \textbf{log2} is the binary logarithm defined by: ${\rm log2}(x) = \log(x)/\log(2)$.

\item It is defined only for $x \in [0; +\infty]$.
\end{itemize}
See also: \textbf{log} (\ref{lablog}), \textbf{log10} (\ref{lablog10})
