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[Frank <address@hidden>]

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,