When writing mathematics, it is usually needed to "negate" an expression. For example, on Math you can insert "exists" but not "not exists". On mathematics there are almost an equal number of normal and "negated" symbols: adding a "not" operator will simplify using them without the need to define all those symbols again.
[This is an automated message.] This bug was filed before the changes to Bugzilla on 2011-10-16. Thus it started right out as NEW without ever being explicitly confirmed. The bug is changed to state NEEDINFO for this reason. To move this bug from NEEDINFO back to NEW please check if the bug still persists with the 3.5.0 beta1 or beta2 prereleases. Details on how to test the 3.5.0 beta1 can be found at: http://wiki.documentfoundation.org/QA/BugHunting_Session_3.5.0.-1 more detail on this bulk operation: http://nabble.documentfoundation.org/RFC-Operation-Spamzilla-tp3607474p3607474.html
The feature requested is not implemented on 3.5 beta2 yet.
So, the neg <?> solves your problem?
(In reply to comment #3) > So, the neg <?> solves your problem? "neg" is to take the negation of a Boolean expression. In LaTeX "\not" strikes its argument. For example "\not \in" will produce the same as \notin. In Math, you can do "in" and "notin", but you don't have a general way to strike with a slash (you may however use "overstrike" do draw an horizontal strike) FYI, to implement \not, MathJax tries to get the corresponding negation of a given Unicode character if it exists or uses 'COMBINING LONG SOLIDUS OVERLAY' (U+0338) otherwise. Alternatively, <menclose notation="updiagonalstrike"> could be implemented in Math.
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I understand that is it requested a feature to add easily a strike over a
up diagonal strike still missing in 6.3 master... May be something we can derivate from overstrike.