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\subsection{log}
\label{lablog}
\noindent Name: \textbf{log}\\
\phantom{aaa}natural logarithm.\\[0.2cm]
\noindent Library names:\\
\verb| sollya_obj_t sollya_lib_log(sollya_obj_t)|\\
\verb| sollya_obj_t sollya_lib_build_function_log(sollya_obj_t)|\\
\verb| #define SOLLYA_LOG(x) sollya_lib_build_function_log(x)|\\[0.2cm]
\noindent Description: \begin{itemize}
\item \textbf{log} is the natural logarithm defined as the inverse of the exponential
function: $\log(y)$ is the unique real number $x$ such that $\exp(x)=y$.
\item It is defined only for $y \in [0; +\infty]$.
\end{itemize}
See also: \textbf{exp} (\ref{labexp}), \textbf{log2} (\ref{lablog2}), \textbf{log10} (\ref{lablog10})
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