Double brackets

[Dan]

I am trying to write a Lie bracket [[a, b ]].  The commands \llbracket and
\rrbracket work just fine in the LyX math formula, but doesn't render in
LuaTex.  I could conceivably use a negative space and join the symbols |
and [ (with some fussing) but I can't get LyX to recognize \! as a negative
spacer.  (That's another question, really.  I don't need that answered here
if there is a simpler way to do this.)

Thanks!

-Dan
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