at sign creates parsing error in math code where it doesn't in TeX
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	MarkAHershberger
	Dec 4 2015, 10:01 PM

Description

Typing the "@2" into a VisualEditor math edit box results in the error message "Failed to parse (lexing error): @2".

Creating a page with the wikitext:

<math>
@2
</math>

results in the same error message.

However, putting

\begin{equation}
@2
\end{equation}

in a LaTeX document simply produces "@2".

Status	Assigned	Task
Open	None	T120440 at sign creates parsing error in math code where it doesn't in TeX
Resolved	Physikerwelt	T74240 Remove PNG only rendering mode
Resolved	• mobrovac	T71702 Support PNG output for mathoid
Declined	Physikerwelt	T78056 Storing PNG images retrieved from mathoid
Declined	Physikerwelt	T100514 use binary data rather than text data for math_mathml, math_html and math_svg fields
Resolved	Physikerwelt	T94379 Travis PNG looks different from vagrant png

MarkAHershberger raised the priority of this task from to Needs Triage.

MarkAHershberger updated the task description. (Show Details)

We could now add the at sign to the whitelist for allow characters, but what's the mathematical use for that?

We could now add the at sign to the whitelist for allow characters, but what's the mathematical use for that?

Not sure if mathoid allows it but the AMScd extension (re-implementing the AMScd package for commutative diagrams) uses the @ as an active character to indicate the starting point of an arrow. See http://meta.math.stackexchange.com/questions/2324/how-to-draw-a-commutative-diagram for some examples.

Physikerwelt triaged this task as Medium priority.May 29 2018, 2:18 PM

Pkra moved this task from Inbox to texvc on the Math board.Dec 7 2018, 11:14 AM