[OS X TeX] Invisible text

Alain Schremmer schremmer.alain at gmail.com
Sun May 27 13:53:27 EDT 2007

1) I often switch between two environments, for instance:


		{\begin{enumerate}\item #1\item #2}%


and then in the document


		{First test phrase}
		{Second test phrase}

Where I ran into trouble of course is when, instead of "Formatted", I  
needed an environment that would do nothing. I then tried


but even though Lamport mentions \invisible on page 161 of the  
Addendum to the Second Preliminary Ed. (July 13, 1998), Companion 2ed  
does not mention it and all I found via Google was, at http:// 
theory.stanford.edu/people/arjun/ak-grad.html, the following "LaTeX  
trick" which I didn;t understand and didn't work for me:

	\mbox{} - used to create invisible text

2) The only way I have found is, instead of the above, do the  
ifthenelse in the document with \newenvironment{Naught}{ }{ } but,  
while it works, as I have a lot of nested ifthenelse, that turns into  
a nightmare.

Very hopeful regards

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