Help:FAQ/Technical questions/Problem with Eqn template

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)