lyxmath-modesymbols
How do I insert the line "|" after the equation in LaTeX (see image below)?
I'm using LyX so if you can point me to the symbol of that line is also OK.
I don't know if this line has a proper name so the title of this question may be very vague. If you could provide me a name, I'll edit this question's title.
Like this?
To get the vertical bar a bit larger, you can use \raisebox. This way, the \vert will be in the normal math size and x will be in the \scriptsize style. Alternatively, you can use \mbox if you don't like \raisebox. In this case, the usual font sizes can be used (tiny, scriptsize, footnotesize, small, normalsize, large, Large, LARGE, huge, Huge).
\documentclass{article}
\usepackage{amsmath,mathptmx}
\begin{document}
\[
df\,\raisebox{-.5em}{$\vert_{x}$} \colon T_x M \to T_y N
\]
%
\[
df\,_{\mbox{$\vert_{x}$}} \colon T_x M \to T_y N
\]
\end{document}
Best Answer
You could just type the symbol (
|) directly. This won't scale, to get it larger you could use the same technique as Niel de Beaudrap. In the LyX GUI this is done via the Insert Delimiter button on the math toolbar:Set the left delimiter to None, and the right to
|. Uncheck Keep matched, and let the Size be set to Variable:In LyX this looks like as below (left). The dotted vertical line indicates an invisible delimiter (as
\left.in Niels example). Result in PDF on the right.Edit in response to Marcs answer:
To use
\rvertI think you have to use ERTs. If you don't have any other math constructs that useamsmath, you may have to make LyX use this package manually: Document --> Settings --> Math options. Uncheck Use AMS math package automatically, and check Use AMS math package.In your equation, add an ERT (Ctrl + L) and type
\biggr\rvert. That is, the first backslash may appear automatically, in which case don't type it.\biggris one of several commands for manually scaling a delimiter, rather than the automatic provided by\left \right. Other sizes are\bigr,\Bigrand\Biggr, with the latter being the largest. For left delimiters, replacerwithl. (See section 4.14.1 Delimiter sizes inamsmaths manual.)Should you want to use
\left\right, you need to add an ERT with\left.before the fraction (or whatever it is) and have\right\rvertin the one after.