Math & Science ⇒ alignment problem

[abu aasiyah]

Hello,

As usual I am having problems with my alignment. I think I have to make a selfstudy on this subject. Belox are two column(one to the right og the arrow and one to the left). As is obvious the column to the left looks weird. How can I align it to the left?

Code: Select all

\documentclass[12pt,a4paper]{article} 
\usepackage[latin1]{inputenc} 
\usepackage[danish]{babel} % danske overskrifter
\usepackage[T1]{fontenc} 
\usepackage{lmodern} 
\usepackage{graphicx} 
\usepackage{mathtools}
\usepackage{amsmath}

\begin{document}

\begin{align*}
\int\varphi''''_{1}& \qquad \Leftrightarrow \qquad &\varphi'''_{1}=C_{1} &\\
\int\varphi'''_{1} &\qquad \Leftrightarrow \qquad & \varphi''_{1}=C_{1}\xi + C_{2} \\
\int\varphi''_{1} &\qquad \Leftrightarrow \qquad & \varphi'_{1}=\frac{1}{2}C_{1}\xi^{2} + C_{2}\xi + C_{3} \\
\int\varphi'_{1} &\qquad \Leftrightarrow \qquad & \varphi_{1}=\frac{1}{6}C_{1}\xi^{3} + \frac{1}{2}C_{2}\xi^{2} + C_{3}\xi + C_{3} 
\end{align*}

\end{document}

Thanks.

[localghost]

I remember that some time ago you introduced a similar problem [1]. At that time I suggested to use the alignat* environment. I do the same here.

Code: Select all

\documentclass[12pt,a4paper,danish]{article}
\usepackage[T1]{fontenc}
\usepackage[latin1]{inputenc}
\usepackage{babel}
\usepackage{lmodern}
\usepackage{amsmath}

\begin{document}
  \begin{alignat*}{2}
    \int\varphi''''_1 \qquad &\Leftrightarrow \qquad & \varphi'''_1&=C_1 \\
    \int\varphi'''_1 \qquad &\Leftrightarrow \qquad & \varphi''_1&=C_1\xi+C_2 \\
    \int\varphi''_1 \qquad &\Leftrightarrow \qquad & \varphi'_1&=\frac{1}{2}C_1\xi^2+C_2\xi+C_3 \\
    \int\varphi'_1 \qquad &\Leftrightarrow \qquad & \varphi_1&=\frac{1}{6}C_1\xi^3+\frac{1}{2}C_2\xi^2+C_3\xi+C_3
  \end{alignat*}
\end{document}

Furthermore I suggest to take a look into the "Math mode" document. There you will find some useful explanations concerning this environment.

[1] moving line to the right


Best regards
Thorsten

[Stefan Kottwitz]

Hi Abu,

very good example, because it's compilable. The alignment of this math environment is right in the left column and left in the right column, aligning at the relation symbol. You could align at more places using the alignat environment:

Code: Select all

\begin{alignat*}{2}
&\int\varphi''''_{1}& \qquad \Leftrightarrow \qquad &\varphi'''_{1}=C_{1} \\
&\int\varphi'''_{1} &\qquad \Leftrightarrow \qquad & \varphi''_{1}=C_{1}\xi + C_{2} \\
&\int\varphi''_{1} &\qquad \Leftrightarrow \qquad & \varphi'_{1}=\frac{1}{2}C_{1}\xi^{2} + C_{2}\xi + C_{3} \\
&\int\varphi'_{1} &\qquad \Leftrightarrow \qquad & \varphi_{1}=\frac{1}{6}C_{1}\xi^{3} + \frac{1}{2}C_{2}\xi^{2} + C_{3}\xi + C_{3}
\end{alignat*}

It could be even better aligned, for instance additionally on the = equal sign.

Code: Select all

\begin{alignat*}{3}
&\int\varphi''''_{1}& \qquad \Leftrightarrow \qquad &&\varphi'''_{1}&=C_{1} \\
&\int\varphi'''_{1} &\qquad \Leftrightarrow \qquad && \varphi''_{1}&=C_{1}\xi + C_{2} \\
&\int\varphi''_{1} &\qquad \Leftrightarrow \qquad && \varphi'_{1}&=\frac{1}{2}C_{1}\xi^{2} + C_{2}\xi + C_{3} \\
&\int\varphi'_{1} &\qquad \Leftrightarrow \qquad && \varphi_{1}&=\frac{1}{6}C_{1}\xi^{3} + \frac{1}{2}C_{2}\xi^{2} + C_{3}\xi + C_{3}
\end{alignat*}

Stefan