LaTeX multiline equation is not working!

1. Mar 17, 2010

analogmaster

Hi all,

I am using LeD and texlive09 for latex editing. I want to render a multi-line equation and for that I am trying with "\\" - this operator. But it is not rendering. I have included "amsmath" package. I am clueless about why the problem happens. Please help me...

Regards
Sam

2. Mar 17, 2010

matonski

What are you trying to type? You can even just enter it into your reply to test if it works. Quote my reply to see what I typed below:

$$\begin{gather*} \nabla \cdot \vec E = \frac{\rho}{\epsilon_0} \\ \nabla \times \vec E = -\dfrac{\partial \vec B}{\partial t} \\ \nabla \cdot \vec B = 0 \\ \nabla \times \vec B = \mu_0\epsilon_0\dfrac{\partial \vec E}{\partial t} + \mu_0 \vec J \end{gather*}$$

3. Mar 17, 2010

analogmaster

Yes it works! But it doesn't show up the reference to the equation in toc. using it should work...shouldn't it?

regards
Sam

4. Mar 17, 2010

minger

You typically have to enter an additional environment. I don't believe the standard compiler I use allows multiline equations simply inside of the equation environment. I use the split environment, e.g.
$$\begin{split} a &= b + 1\\ c &= a + 10 \end{split}$$

Code (Text):

\begin{split}
a &= b + 1\\
c &= a + 10
\end{split}

5. Mar 17, 2010

Hepth

I always use "\begin{eqnarray}" then your \\ will work., though it numbers the lines.

If the problem persists it may be you're trying to break up brackets:

Code (Text):

\begin{array}{c}
this is a test \left(hello \\
hello two \right)
\end{array}
gives an error but

Code (Text):

\begin{array}{c}
this is a test (hello \\
hello two )
\end{array}
doesn't. Can't split the \left( and \right)'s up

Last edited: Mar 18, 2010
6. Apr 20, 2010

tigra

You cannot split \left<stuff> and \right<stuff>
You must use "fake" right/left instead:

Code (Text):

\begin{array}{c}
this is a test \left(hello \right.\\
\left. hello two \right)
\end{array}

7. Apr 22, 2010

kbaumen

There are several environments that essentially perform the same thing with subtle differences.

I personally use {align} if I want to reference every line.

8. Apr 24, 2010

miha

hi!!

I have this equation that I want to split in 4 parts.

$d(x,z) = \mid x-z \mid _{p} = \mid (x-y) + (y-z) \mid _{p} \leqslant \mbox{ max (} \mid x-y \mid _{p} \mbox{, } \mid y-z \mid _{p} \mbox{)} = \mbox{ max (} d(x,y), d(y,z) \mbox{).}$

I have tried : $d(x,z) = & \left(\mid x-z \mid _{p} \right. \\ & \left. = \mid (x-y) + (y-z) \mid _{p} \right. \\ & \left. \leqslant \mbox{ max (} \mid x-y \mid _{p} \mbox{, } \mid y-z \mid _{p} \mbox{)} \right. \\ & \left. \mbox{ max (} d(x,y), d(y,z) \mbox{).}$ \right) \]

But it is not working.

Can you help me? Thank you,
Miha

9. Apr 27, 2010

trambolin

\begin{align} d(x,z) &= \mid x-z \mid _{p} \\ &= \mid (x-y) + (y-z) \mid _{p} \\ &\leqslant \mbox{ max (} \mid x-y \mid _{p} \mbox{, } \mid y-z \mid _{p} \mbox{)} \\ &= \mbox{ max (} d(x,y), d(y,z) \mbox{).} \end{align}

If you don't want equation numbers, use the starred versions of align,
\begin{align*} d(x,z) &= \mid x-z \mid _{p} \\ &= \mid (x-y) + (y-z) \mid _{p} \\ &\leqslant \mbox{ max (} \mid x-y \mid _{p} \mbox{, } \mid y-z \mid _{p} \mbox{)} \\ &= \mbox{ max (} d(x,y), d(y,z) \mbox{).} \end{align*}

10. Apr 29, 2010

miha

Thank you very much!!

regards,
miha