Yup! The last two lines break the backlash-right clause.

Cool tool! Thanks.

On Wed, Aug 31, 2011 at 8:57 PM, Ted Dunning <ted.dunning@gmail.com> wrote:

> Hmm... I see this:
>
>
> http://latex.codecogs.com/gif.latex?F(x,y)=0%20~~\mbox{and}~~%20\left|%20\begin{array}{ccc}%20F''_{xx}%20&%20F''_{xy}%20&%20F'_x%20\\%20F''_{yx}%20&%20F''_{yy}%20&%20F'_y%20\\%20F'_x%20&%20F'_y%20&%200%20\end{array}\right|%20=%200<http://latex.codecogs.com/gif.latex?F%28x,y%29=0%20%7E%7E%5Cmbox%7Band%7D%7E%7E%20%5Cleft%7C%20%5Cbegin%7Barray%7D%7Bccc%7D%20F%27%27_%7Bxx%7D%20&%20F%27%27_%7Bxy%7D%20&%20F%27_x%20%5C%5C%20F%27%27_%7Byx%7D%20&%20F%27%27_%7Byy%7D%20&%20F%27_y%20%5C%5C%20F%27_x%20&%20F%27_y%20&%200%20%5Cend%7Barray%7D%5Cright%7C%20=%200>
>
> Must be a cut and paste kind of thing.
>
> On Wed, Aug 31, 2011 at 10:50 PM, Ken Krugler
> <kkrugler_lists@transpac.com>wrote:
>
> > > F(x,y)=0 ~~\mbox{and}~~
> > > \left| \begin{array}{ccc}
> > >  F''_{xx} & F''_{xy} &  F'_x \\
> > >  F''_{yx} & F''_{yy} &  F'_y \\
> > >  F'_x     & F'_y     & 0
> > >  \end{array}\
> > > right| = 0
> >
> > The codecogs.com site says that it's an invalid equation.
>



-- 
Lance Norskog
goksron@gmail.com