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the \less latex symbol doesn't show properly in firefox . (it is in the latex A4 manual table 97) example $ \forall x \exists y (x \less y) $

Or am I making a simple mistake (would not be the first time)

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    $\begingroup$ \less doesn't appear to be among the $\LaTeX$ symbols supported by MathJax. Moreover, the Comprehensive $\LaTeX$ Symbol List indicates that it is part of the MnSymbol package. What's wrong with simply using $<$ to produce $<$? $\endgroup$ – user642796 Feb 25 '14 at 8:50
  • $\begingroup$ @ArthurFischer thanks that is new the list you mention isn't mentioned on meta.math.stackexchange.com/questions/5020/… i just always thought that all Tex from the symbol list was available, should we adjust the tutorial? $\endgroup$ – Willemien Feb 25 '14 at 9:00
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    $\begingroup$ If you want to use a \ expression for $<$, try $\lt$. $\endgroup$ – Daniel R Feb 25 '14 at 9:15
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    $\begingroup$ @Willemien: symbols-a4.pdf is "The Comprehensive $\LaTeX$ Symbol List" of glyphs available from many packages. MathJax supports some of the packages, but not all. On math.SE, the "TeX-AMS_HTML-full" configuration is used, which includes most of the AMS symbols. Including more packages imposes a larger overhead on each user, and there does not seem to be a great need for more (except for those who would like commutative diagrams). $\endgroup$ – robjohn Mod Feb 25 '14 at 14:16
  • $\begingroup$ @robjohn thanks, I was just unaware of that (it is not in the tutorial, or did i mis something?) $\endgroup$ – Willemien Feb 25 '14 at 17:04
  • $\begingroup$ Just use $<$ to make $<$. On the other hand, if you want to make $\le$ (less than or equal sign), use $\le$. $\endgroup$ – TrueDefault Feb 26 '14 at 8:33
  • $\begingroup$ Using $<$ can sometimes confuse the system, since < also signals an HTML tag. If you always follow < with a space, you should be OK. $\endgroup$ – GEdgar Mar 2 '14 at 14:47
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The answer was given by Daniel R in the comment. Expanding it a bit: you can use

  • $\lt$ and $\gt$ for $\lt$ and $\gt$.
  • $\le$ and $\ge$ for $\le$ and $\ge$. Or $\leq$ and $\geq$ for the same effect.

Full list of LaTeX-supported symbols is here.


As an aside, I will [sort of] answer Arthur Fisher's comment by copying it from the HTML source of this page:

What's wrong with simply using $&lt;$ to produce $&lt;$?

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