LaTeX multiline equation is not working!

  • #1
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
 

Answers and Replies

  • #2
166
0
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:

[tex]
\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*}
[/tex]
 
  • #3
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
 
  • #4
minger
Science Advisor
1,495
2
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.
[tex]
\begin{equation}
\begin{split}
a &= b + 1\\
c &= a + 10
\end{split}
\end{equation}
[/tex]

Code:
\begin{equation}
\begin{split}
a &= b + 1\\
c &= a + 10
\end{split}
\end{equation}
 
  • #5
Hepth
Gold Member
448
39
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:
\begin{equation}
\begin{array}{c}
this is a test \left(hello \\
hello two \right)
\end{array}
\end{equation}
gives an error but

Code:
\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
 
Last edited:
  • #6
1
0
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:
\begin{equation}
\begin{array}{c}
this is a test \left(hello \\
hello two \right)
\end{array}
\end{equation}
gives an error but

Code:
\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:

Code:
\begin{equation}
\begin{array}{c}
this is a test \left(hello \right.\\
\left. hello two \right)
\end{array}
\end{equation}
 
  • #7
192
0
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
2
0
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
341
0
[tex]
\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}
[/tex]

If you don't want equation numbers, use the starred versions of align,
[tex]
\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*}
[/tex]
 
  • #10
2
0
Thank you very much!!

regards,
miha
 

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