Text Formatting ⇒ No "therefore" Sign available

[sgsawant]

The following code works fine:

Code: Select all

\begin{equation}
\label{eq:MmD}
{M_{\text{mD}}=\frac{m_l}{\sqrt{{(\frac{f_{\text{N$\_$ul}}}{f_{\text{N$\_$l}}})}^2-1}}}.
\end{equation}

but the following doesn't:

Code: Select all

\begin{equation}
\label{eq:MmD}
\therefore~{M_{\text{mD}}=\frac{m_l}{\sqrt{{(\frac{f_{\text{N$\_$ul}}}{f_{\text{N$\_$l}}})}^2-1}}}.
\end{equation}

Please explain.

[Stefan Kottwitz]

That's not a standard symbol. You have to load a package which provides it, such as amssymb.

Code: Select all

\usepackage{amssymb}

Stefan

[sgsawant]

Thanks!