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[Giovanni Piredda <address@hidden>]

The standard way is to find out the symbol and the set up a new 
shortcut. I looked in math-kbd.scm for an opening bracket and I found 
the shortcut that I paste below, where there are two things I do not 
know what they do ;-), but you can try and use it substituting the 
opening and closing symbol for the formal Laurent series for the 
<llbracket> and <rrbracket>

 ("[ [ var" (math-bracket-open "<llbracket>" "<rrbracket>" 'default))

On 22.12.21 20:21, Frank wrote:
> Dear all,
>
> I see that there is a way to input the formal power series [[t]] by 
> inputting "[[" then press the TAB. It does not work directly for the 
> formal Laurant series ((t)). I wonder how to do that properly? Thanks.
>
> Best wishes,
> Frank