0

I have this equation:

\documentclass[a4paper,12pt]{article}
\usepackage{amsmath}
\title{}
\author{}
\date{}
\begin{document}
\begin{equation}
   \frac{u(x,t)-u(x,t-k)}{k}=c\frac{u(x+h,t)-2u(x,t)+u(x-h,t)}{h^2}+(\frac{u(x+h,t)-u(x-h,t)}{2h})(\frac{c(x+h,t)-c(x-h,t)}{2h}) \\
\end{equation}
\end{document}

The problem is that it goes off the page. So I tried:

\begin{align}
  \frac{u(x,t)-u(x,t-k)}{k} \\
  =& c\frac{u(x+h,t)-2u(x,t)+u(x-h,t)}{h^2}+(\frac{u(x+h,t)-u(x-h,t)}{2h})(\frac{c(x+h,t)-c(x-h,t)}
  {2h})
\end{align}

That doesn't seem to work either. Any advice?

0

You could use multline.

\documentclass[a4paper,12pt]{article}
\usepackage{amsmath}
\title{}
\author{}
\date{}
\begin{document}

\begin{multline}
  \frac{u(x,t)-u(x,t-k)}{k} 
  = c\frac{u(x+h,t)-2u(x,t)+u(x-h,t)}{h^2}\\
 +\left(\frac{u(x+h,t)-u(x-h,t)}{2h}\right)
 \left(\frac{c(x+h,t)-c(x-h,t)}{2h}\right) 
\end{multline}

\begin{multline}
  \frac{u(x,t)-u(x,t-k)}{k} 
  = c\frac{u(x+h,t)-2u(x,t)+u(x-h,t)}{h^2}\\
 +\Bigl(\frac{u(x+h,t)-u(x-h,t)}{2h}\Bigr)
 \Bigl(\frac{c(x+h,t)-c(x-h,t)}{2h}\Bigr) 
\end{multline}
\end{document}

enter image description here

| improve this answer | |
  • Thanks, I didn't actually know that \left or \Bigl even existed. But looking at the way you've written the equations, \Bigl seems to be smaller than \left. Is that correct? – dave Apr 19 at 13:58
  • 1
    @dave Yes. Some do not like \left and \right so they prefer to add the parentheses by hand. I actually think that \left(...\right) looks better. – user194703 Apr 19 at 13:59
  • Same! Also just for knowledge, if I wanted to put equals in a new line, how could I do that? For example, ``` x = 5 + 1 = 6 ``` So basically, something on the top line and having equals on the next line but on the left of it – dave Apr 19 at 14:03
  • 1
    @dave Then use align. \documentclass[a4paper,12pt]{article} \usepackage{amsmath} \begin{document} \begin{align} x &= 5 + 1\notag\\ & = 6 \end{align} \end{document} The & goes before the = of the respective line. – user194703 Apr 19 at 14:05
  • 1
    @dave I do not understand this comment. – user194703 Apr 19 at 17:59

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