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I've been looking and trying for the past hour and I can't figure it out. I'm pretty new to LateX and I'm trying to display my Differential equations working but it's turning into a big mess.

I'm basically trying to get each equation on a line and aligned in the center. Here is what I've tried, but in vain:

\begin{equation}
    \frac{dx}{dt} = -r(x-x_{e})\\
    \frac{dx}{9} = -rdt\\
    \int\frac{dx}{x-x_{e}} = \int -rdt\\
    ln|x-x_{e}| = -rt + ln |C|
\end{equation}

Any help is greatly appreciated.

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  • Welcome, you are using the wrong environment. Try align and put ampersands (&) right before the equal signs.
    – Johannes_B
    May 15, 2016 at 14:03
  • Equation is for one-line equations.
    – Bernard
    May 15, 2016 at 14:04
  • If you don't care about alignment, use the gather environment.
    – Johannes_B
    May 15, 2016 at 14:04
  • 1
    Strange ODE this is ;-)
    – user31729
    May 15, 2016 at 14:16
  • @ChristianHupfer the random 9 was to test if I was doing something wrong with the brackets ;) It's always good to have a single value for tracing purposes :-)
    – nTuply
    May 15, 2016 at 15:36

1 Answer 1

2

I would use the align environment from mathtools here. Please have a look at the other small adjustments i made.

ntuplyAlign

\documentclass{article}
\usepackage{mathtools}
\usepackage{physics}
\begin{document}
\begin{align}
    \dv{x}{t}                 &= -r(x-x_{e})\\
    \frac{\dd x}{9}           &= -r\dd{t}\\
    \int\frac{\dd x}{x-x_{e}} &= \int -r\dd{t}\\
    \ln\abs{x-x_{e}}          &= -rt + \ln \abs{C}
\end{align}
\end{document}
3
  • align is part of amsmath, not mathtools (though since mathtools includes amsmath anyways, it doesn't matter much). May 15, 2016 at 16:08
  • @ArunDebray mathtools fixes many bugs from amsmath, so i silently skip over mentioning amsmath.
    – Johannes_B
    May 15, 2016 at 16:16
  • Instead of setting up a completely new information system for starters, they should fix the LaTeX-Wikibook. I wouldn't even mind a really big ShareLaTeX has fixed this page on every article their guy updates.
    – Johannes_B
    May 15, 2016 at 16:18

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