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\newcommand*\recnrm[1]{\left[\!\left]#1\right[\!\right]} It's a first step, that can be “tweaked” but the important part is that you use a command \recnrm{x} or \recnrm{\frac{A}{B}}. Then you can change the definition later.


You can abuse the tilde accent together with a \vrule to build your own \simeq. However, you need a font with an extensible \widetilde for that. The non-free font mtpro2 has this accent. \documentclass{article} \usepackage{amsmath} \usepackage[lite]{mtpro2} \begin{document} $A \stackrel{\text{mytext}}{\lower 2.5pt \hbox{$\widetilde{\vrule width 25pt ...

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