LyX ⇒ macro install on LyX
macro install on LyX
If you can tolerate this level of noobness, please help ...
thx!
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macro install on LyX
If you have installed the needed packages later or if they were not part of the default installation then run LyX -> LyX -> Reconfigure to let LyX search for new packages (I am not on Windows so I do not know whether you have to do some setup in MikTeX before that, on Unix this is called tex hash I think) and restart LyX. The packages should now be available.
Maybe this page may also help you? (However, I think that with the new LyX version coming up this page will be outdated soon)

Re: macro install on LyX
however LyX does not display the result WYSIWYG
the brackets i need are \llbracket
the end compilation comes out ok...but no workspace preview in LyX.
Strange the the WYSIWYG engine of LyX does not support this...