[Tugindia] equation- how to

[Duvvuri Venu Gopal]

  Dear Sreejith,

Have you gone through the LaTeX Primer? or The Not So Short Introduction to LaTeX? or any other book. All these have good examples.

When $ is encountered TeX starts math composing. Mathematical commandslike \left\{ or \int are available only in math mode. When TeX encounters these commands and if they are not in math mode TeX inserts a $.

The problem in your equation may be that you have not kept them
in math mode i.e., between

1) \begin{equation} ... \end{equation} or
2) $$ ... $$ or
3) \begin{eqnarray} ... \end{eqnarray}

Please read the above mentioned abooks - LaTeX Primer is available from www.tug.org.in. The second book might already there on your hard disk - search for lshort.pdf. For maths the best book is by Herbert Voss called Mathmode.

With best wishes

D. Venu Gopal
 


On Thu, 20 Oct 2005 Sreejith Pulloor wrote :
>seems to be simple but didnt have any success
>
>i want to have two equations aligned (without numbes) inside a left bracket "{ "
>i tried like following (please understand i dont have much experience
>using latex... so might be wierd way--)
>
>  \left\{
>\begin{array}{l}
>\mbox
>{
>\begin{equation*}
>\mu (\nabla u , \nabla v) &=& (f,v)
>\end{equation*}
>}
>\mbox
>{
>\begin{equation*}
>(\nabla \cdot{u},q) &=& 0
>\end{equation*}
>}
>\end{array}
>\right.
>
>it didnt work..
>and i also have some questions on how to interpret some of the  error messages.
>for example when i tried the above tex thrown some error message  like
>following:
>
>! Missing $ inserted.
><inserted text>
>                 $
>l.42  \left
>            \{
>?
>
>now my question is whats the meaning of
>! Missing $ inserted. (what should i make it from this)
>and etc..
>sorry if i am being so stupid in sending these kind of silly
>questions... excuse me
>
>thanks for your help.
>
>Sreejith
>
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