[Tugindia] equation- how to

CV Radhakrishnan cvr at river-valley.com
Thu Oct 20 07:11:38 CEST 2005


On Thu, October 20, 2005 2:37 am, Sreejith Pulloor said:
> 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}

[...]

> \right.

> it didnt work..

The best way would be to try the following:

 $$\left\{
  \begin{array}{lcl}
   \mu (\nabla u , \nabla v) &=& (f,v)\\
   (\nabla \cdot{u},q) &=& 0
  \end{array}
 \right.$$

Alternatively, insert '\usepackage{amsmath}' in the preamble and then:

 $$
  \begin{cases}
   \mu (\nabla u , \nabla v)& = (f,v)\\
   (\nabla \cdot{u},q)&= 0
  \end{cases}
 $$

In cases environment, you need not enter any braces, it will be
automatically added.

> 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.

Since \left, \right, \mu etc will work only math mode, math shift
character '$' is needed before you use these commands.  So, TeX says that
a '$' (in other words math shift character) is missing.

-- 
Radhakrishnan




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