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  • Works almost, except for the second vertical in e.g. \LBraket{\rho| \hat{\hat{A}} | \rho}, the way \Braket does. Would there be a way to incorporate that as well? Commented Oct 27, 2011 at 20:26
  • Well, that indeed does two bars, but unlike the first version, it doesn't seem to scale the negative spacing between the two delimiters. Actually, if someone can pick it apart, I'd love to be able to understand how the original \lleft macro works... what's the trick there? Commented Oct 28, 2011 at 11:39
  • @MichaelGoerz See edited answer; I'm still studying the \lleft and \rright magic. :) Commented Oct 28, 2011 at 12:39
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    @egreg: Is it possible to modify the code in such a way that the following works: \LBlleft{\{[}#1{]\}}\LBrright. I mean to set two different delimiters. Commented Oct 29, 2011 at 8:40