LaTeX multiline equation is not working

[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

 

[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:

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

 

[analogmaster]

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

regards
Sam

 

[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.
$$\begin{equation} \begin{split} a &= b + 1\\ c &= a + 10 \end{split} \end{equation}$$

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

 

[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:

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

gives an error but

\begin{equation}
\begin{array}{c}
this is a test (hello \\
hello two )
\end{array}
\end{equation}

doesn't. Can't split the \left( and \right)'s up

 

[tigra]

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:

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

gives an error but

\begin{equation}
\begin{array}{c}
this is a test (hello \\
hello two )
\end{array}
\end{equation}

doesn't. Can't split the \left( and \right)'s up

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

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

 

[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.

 

[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

 

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

 

[miha]

Thank you very much!

regards,
miha