https://bugzilla.wikimedia.org/show_bug.cgi?id=73367

            Bug ID: 73367
           Summary: MathML: Using en dash as minus takes a parser error
           Product: MediaWiki extensions
           Version: unspecified
          Hardware: PC
                OS: Windows 7
            Status: NEW
          Severity: normal
          Priority: Unprioritized
         Component: Math
          Assignee: [email protected]
          Reporter: [email protected]
                CC: [email protected], [email protected],
                    [email protected]
       Web browser: ---
   Mobile Platform: ---

Created attachment 17114
  --> https://bugzilla.wikimedia.org/attachment.cgi?id=17114&action=edit
screenshot showing the parser error

If a formula uses a hyphen as minus char, it is shown correctly. Replacing the
hyphen by en-dash – U+2013 by Alt-0-1-5-0 – will take a parser error in some
situations. Note: German typographical rules demand en-dash as minus char; a
user should be able to write it within formulas in each case.

Example: screenshot (attachment) and de-Wikibooks:
https://de.wikibooks.org/w/index.php?title=Wikibooks:Spielwiese&oldid=722798

Environment: de-Wikibooks - user preferences: rendering with MathML and SVG/PNG
- Windows 7 Home Premium SP1 with Firefox 33.1

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