Re: Equations moving in overlays

I remember having an issue related to this before. Like yourself, I was 
able to increment the equations, but they shifted slightly on each 
slide. The trick is to use two sets of curly braces. Actually, I had 
posted this peculiarity to the mailing list asking why it had to be done 
this way. Apparently, it was the result of some prosper/pstricks/amsmath 
combination. Anyway, the {{....}} seems to fix the problem and it is a 
common solution. As pointed out when I originally posted, an example can 
be seen here:

http://www.math.ntnu.no/~varslot/prosper-presentation.pdf

Example from the PDF:

\begin{align*}
\fromSlide{5}{{\lim_{N\uparrow\infty}}}
1
\fromSlide{2}{{+\frac{1}{4}}}
\fromSlide{3}{{+\frac{1}{9}}}
\fromSlide{4}{{\hdots +\frac{1}{Nˆ2}}}
\fromSlide{5}{{=\sum_{k=1}ˆ{\infty}\frac{1}{nˆ2}}}
\fromSlide{6}{{=\frac{\piˆ2}{6}}}
\end{align*}

This will have a centered equation that does not shift with each slide.  Again, if anyone has determined an exact reason as to why this must be done to avoid shifting, I would enjoy the answer.  

Consider the following

\providecommand*{\dumb}[3][]{#1 #2^#3}

versus

\providecommand*{\dumb}[3][]{#1 {#2}^{#3}}

The extra curly braces is necessary to allow for the possibility that #2 has a superscript!  In an unrelated manner :-) perhaps there needs to be a set of curly brakets about the argument in the definition of \fromSlide.  Obviously, I'm just guessing here.

I hope that I have not misunderstood your post,
Chris

>  
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