On 18.02.08, Jean-Marc Lasgouttes wrote:
> "Paul A. Rubin" <[EMAIL PROTECTED]> writes:

> > Hi all,
> >
> > I just discovered (the hard way) that LyX understands to map \implies
> > to \Longrightarrow in the GUI (or at least displays the same glyph for
> > both), but LaTeX does not recognize \implies.  I suspect that there's
> > some package, not loaded by my document, that maps \implies to
> > \Longrightarrow.
> >
> > So I wonder if LyX should either (a) automatically load whatever the
> > missing package is if the user types in \implies, or (b) not display
> > \implies, or (c) substitute \Longrightarrow for \implies (so that the
> > document compiles)?  Opinions?

> The missing package seems to be amsmath and LyX should definitely
> require it automatically. I am not sure however where to do it.

Additional info:

In LyX 1.5.3 on Debian, it works fine with 

   Document > Settings > Math > Use AMS   always [x]
   
but fails with   

   Document > Settings > Math > Use AMS   automatically [x]


(So setting the mandatory use of AMS is a quick and dirty fix to the
document.)

GM

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