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I am new to LaTeX and have a problem with the line
The difference is that the signing key \emph{x} is split into two pieces, \begin{math}
\emph{x_{L}}\end{math} and \begin{math}\emph{x_{R}}\end{math} and are both elements of the
\begin{math}\textbf{Z}_{q}\end{math}.
I get the error
! Missing $ inserted.
<inserted text>
I am a little confused why I am getting this error since I have put the _ in a math section. Any help would be great.
Thanks!
For inline math you should use $ your equation $ or \( your equation \). But \(...\) is fragile. loading fixltx2e makes it robust. For display equation without number, use \[ equation \] or
\begin{equation*}
.
.
.
\end{equation*}
For numbered equations, use
\begin{equation}
.
.
.
\end{equation}
A MWE:
\documentclass{article}
\usepackage{amsmath}
\begin{document}
The difference is that the signing key $x$ is split into two pieces,
$x_{L}$ and \(x_{R}\) and are both elements of the $x_{L}$
\[\mathbf{Z}_{q}.\]
\begin{equation}
\mathbf{Z}_{q}
\end{equation}
\begin{equation*}
\mathbf{Z}_{q}
\end{equation*}
\end{document}
\emph{} starts in text mode, so its parameter must be text, not math. So you need to go into math mode again within the \emph{}, as in \emph{$x_{L}$}.
$...$ for inline math constructs (See References below).\emph{} within math mode, unless you have a special definition of \emph{}.\textbf{} with \mathbf{}.\documentclass{article}
\begin{document}
The difference is that the signing key $x$ is split into two pieces,
$x_{L}$ and $x_{R}$ and are both elements of the $\mathbf{Z}_{q}$.
\end{document}
Why you use \emph{} for math?
$x_L$ and $\mathbf{Z}_q$ will do the same in simplest form without error.
\emphis a text-mode command, so even though it's within a math-mode environment, a_will be recognized as text. in fact, unless you've done something unusual, the math will be set automatically in italic, so there should be no need for the\emph. also, a shorter way to input in-line math is\( x_L \)and you don't need to bury single-letter subscripts in braces. these things will come with time.