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[Marc Mertens <address@hidden>]

Hi,

   the way I do it is to type in math mode [ (which then displays [])
and press then tab 3 times (You will cycle through the different
variants if you press tab). this trick also works with other types of
brackets.

Hope this helps

Marc

On Sun, 2019-09-15 at 11:12 +0200, Frank wrote:
> Dear all,
> 
> I want to input an open interval ]a,b[ in math mode.
> 
> I know that in the source editing mode, I can put <around*|]|a,b|[> 
> directly. However, I failed to input it directly in normal mode. I
> tried 
> to input \around* then put a "]" in the first argument, but after 
> inputing "]" there, nothing happened. I wonder a good way to do
> this. 
> Thanks!
> 
> Best wishes,
>