Help:FAQ/Technical questions/Problem with Eqn template

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Problem with Eqn template

"I've added a proof sequence using the eqn template, and despite my best efforts the parser barfs on it. It makes a horrendous mess that I can't work out how to clear up."

What's probably happened is that you have included instances of {{ or }} or | in your $\LaTeX$.
The MediaWiki template parser takes precedence over the MathJax one, and views {{ and }} as the beginning and end of the invocation of eqn, thus breaking the $\LaTeX$ in two. Similarly, it interprets | as the MediaWiki instruction to interpret what follows as a parameter value.
In order to get round this, you need to:
  1. Put a conventional space between all instances of {{ and }} to make them { { and } }
  2. Replace all instances of:
    1. | with \vert
    2. || and \| with \Vert, which renders as $\Vert$.
--prime mover (talk) 08:58, 8 March 2013 (UTC)