i need some additional math symbols in latex. I did draw them in eps and include them with:


This works fine for the most things. But it does not work for captions and notes (package: todonotes).

Do you have any better idea? Here is a screenshot of my symbols:

my new symbols

The x is subscript and does not belong to the symbol.

Kind regards, Max


\documentclass[12pt]{article}%, border=2pt]{standalone}


\usepackage{stackengine, amsfonts} %

% Non of these work... :()


 $ \triangleLeft_{\!x}$



% Next line fails!


The error is either (for the first two definitions):

! Argument of \@caption has an extra }.
<inserted text> 
l.25 \caption{$\triangleLeft_{\!x}$}


! Undefined control sequence.
\stackinset #1#2#3#4#5#6->\def \conditioned@inset 
                                                  {\stack@delim #5\stack@del...
l.25 \caption{$\triangleLeft_{\!x}$}

for the third version.

  • 1
    Welcome to the TeX.SE. Excuse me but into the symbol of the triangle, what are? I've never seen these symbols in mathematics enviroments. Could you add a complete code, please? Thank you for your cooperation. – Sebastiano Jul 2 '20 at 11:37
  • I'd say something like \newcommand{\triangleLeft}{\mathrel{\text{\includegraphics[height=0.8\strutbox]{../triangleleft}}}} – egreg Jul 2 '20 at 12:58
  • 1
    @Sebastiano The symbols represent that $x$ is in the symmetric difference of two sets. In the case of triangleLeft, $x$ is in the left set, and in the other case analog. – nopx Jul 17 '20 at 12:18
  • 2
    @nopx If you plan to use it in captions or titles, use \DeclareRobustCommand instead of \newcommand. – egreg Jul 17 '20 at 12:21
  • 1
    @Sebastiano It is newly defined by me for my thesis because I did not found any better symbol. You cannot know it. :) – nopx Jul 17 '20 at 12:28

You can obtain these symbols very simply with Mnsymbol and the stackinset command from stackengine:

\documentclass[12pt]{article}%, border=2pt]{standalone}
\usepackage{stackengine, amsfonts} %


 $ \rightharpoontriangle_{\!x}$



enter image description here

  • 1
    Very very nice. – Sebastiano Jul 2 '20 at 15:32
  • Does also not work in captions. :( See above ^^ But thanks a lot, very nice symbols. – nopx Jul 17 '20 at 12:12
  • 1
    @nopx: to make it work in captions, use \caption{\protect\leftharpoontriangle}. – Bernard Jul 17 '20 at 13:34
  • Yes, that works! Thanks! Do you have any idea how to make it scale appropriately in super or subscript? – nopx Jul 17 '20 at 13:49
  • Probably defining a series of sizes with `\mathpalette. I don't have time at the moment to test the idea, but I'll do that this week-end. – Bernard Jul 17 '20 at 14:08

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