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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