[Tex/LaTex] Aligning multiple places in equations using align

alignequations

My question is simple. I've played around with the & symbol to align my equations neatly under each other, but I just can't get it to look nice. This is the closest I've got:

\documentclass[11pt,a4paper]{article}
\usepackage[utf8]{inputenc}
\usepackage[english]{babel}
\usepackage{amsmath}
\usepackage{amsfonts}
\usepackage{amssymb}
\begin{document}
\begin{align}
A_{0} & = -\frac{3\sigma_{1}' h H L^{2}}{E (H+h)^{3}} &=& -1.62\times 10^{-6}\,\mathrm{m} \\
B_{0} & = - \frac{3 h H (\alpha_{2}-\alpha_{1}) L^{2}}{(H+h)^{3}} &=&  2.95\times 10^{-8}\,\mathrm{m\,K^{-1}} \\
C_{0} & = \frac{4 L^{3}}{E W (H+h)^{3}} &=& 1.08\,\mathrm{m\,N^{-1}}
\end{align}
\end{document}

which produces the following output:

How can I remove the horizontal space in the middle yet still align the equal signs under each other? It should be the middle equation that dictates the spaces, i.e. the other two equations need to align to that one.

As a final question I could ask: How would you do it to make it 'look nice'?

And yes, I have looked at the other similar questions without luck.

Best Answer

Two solutions with alignat; one of them has two alignment points, the other, three, so that the numeric values are aligned on the integer part of the mantissa:

 \documentclass[11pt,a4paper]{article}
\usepackage[utf8]{inputenc}
\usepackage[english]{babel}
\usepackage{amsmath}
\usepackage{amsfonts}
\usepackage{amssymb}

\begin{document}

\begin{alignat}{3}
A_{0} & = -\frac{3σ_{1}' h H L²}{E (H+h)³} &&= - & & 1.62 × 10⁻⁶\,\mathrm{m} \\
B_{0} & = - \frac{3 h H (α_{2}-α_{1}) L²}{(H+h)³} &&= & & 2.95 × 10⁻⁸\,\mathrm{m\,K⁻¹} \\
C_{0} & = \frac{4 L³}{E W (H+h)³} &&= & & 1.08\,\mathrm{m\,N⁻¹}
\end{alignat}

\begin{alignat}{2}
A_{0} & = -\frac{3σ_{1}' h H L²}{E (H+h)³} &&= - 1.62 × 10⁻⁶\,\mathrm{m} \\
B_{0} & = - \frac{3 h H (α_{2}-α_{1}) L²}{(H+h)³} &&= 2.95 × 10⁻⁸\,\mathrm{m\,K⁻¹} \\
C_{0} & = \frac{4 L³}{E W (H+h)³} &&= 1.08\,\mathrm{m\,N⁻¹}
\end{alignat}

\end{document}

enter image description here

Related Solutions

[Tex/LaTex] List of equations, including equation contents and caption

Since you want a cheat sheet, I'd recommend the extract package. With a slightly different MWE:

\documentclass{article}
\usepackage[
  active,
  header=false,
  copydocumentclass=true,
  generate=\jobname-Cheatsheet,
  extract-env={equation},
  extract-cmdline={synopsis},
  ]{extract} % http://ctan.org/pkg/extract
\begin{extract*}
% Items executed in both the main and extracted document
% (extract manual, section 5.1)
\usepackage{amsmath}
\end{extract*}
\begin{extract}
% Items executed only in extracted document
\def\synopsis#1{#1}
\end{extract}
\def\synopsis#1{}
\begin{document}
First Euler observed that
\synopsis{Euler's equation tying together the five fundamental constants of mathematics}%
\begin{equation}
1 + e^{i \Pi} = 0.
\end{equation}

Then, Gauss discovered the normal distribution:
\synopsis{Normal distribution}%
\begin{equation}
P(x) = \frac{1}{{\sigma \sqrt {2\pi } }}e^{{{ - \left( {x - \mu } \right)^2 } \mathord{\left/ {\vphantom {{ - \left( {x - \mu } \right)^2 } {2\sigma ^2 }}} \right. \kern-\nulldelimiterspace} {2\sigma ^2 }}}
\end{equation}

Finally, Einstein proclaimed: 
\synopsis{Equivalence of mass and energy}%
\begin{equation}
E = m C^2
\end{equation}
\end{document}

you get an original document of:

enter image description here

and an extracted document of:

\documentclass{article}
% Items executed in both the main and extracted document
% (extract manual, section 5.1)
\usepackage{amsmath}
% Items executed only in extracted document
\def\synopsis#1{#1}

\begin{document}

\synopsis{Euler's equation tying together the five fundamental constants of mathematics}%

\begin{equation}
1 + e^{i \Pi} = 0.
\end{equation}

\synopsis{Normal distribution}%

\begin{equation}
P(x) = \frac{1}{{\sigma \sqrt {2\pi } }}e^{{{ - \left( {x - \mu } \right)^2 } \mathord{\left/ {\vphantom {{ - \left( {x - \mu } \right)^2 } {2\sigma ^2 }}} \right. \kern-\nulldelimiterspace} {2\sigma ^2 }}}
\end{equation}

\synopsis{Equivalence of mass and energy}%

\begin{equation}
E = m C^2
\end{equation}

\end{document}

and:

enter image description here

This also works with your original \caption command.

[Tex/LaTex] Aligning multiple rows and columns with different number of equations (Align environment)

\documentclass[a4paper]{article}
\usepackage{mathtools}

\begin{document}
    \begin{alignat}{3}
        x1&=y1  &  &  &      a1&=b1 \label{eq:a} \\
        x2&=y2  & & &      a2&=b2 \label{eq:b} \\
        && \begin{aligned}
         x3&=y3 \\
         a3&=b3
        \end{aligned}& &
        \label{eq:c}
    \end{alignat}
\end{document}

enter image description here

\documentclass[a4paper]{article}
\usepackage{mathtools}

\begin{document}
    \begin{alignat}{3}
        x1&=y1  & \qquad\qquad & \qquad\qquad &      a1&=b1 \label{eq:a} \\
        x2&=y2  & & &      a2&=b2 \label{eq:b} \\
        && \mathclap{\begin{aligned}
         x3&=y3 \\
         a3&=b3
        \end{aligned}}& &
        \label{eq:c}
    \end{alignat}
\end{document}

enter image description here

The long third equation version:

\documentclass[a4paper]{article}
\usepackage{mathtools}

\begin{document}
    \begin{alignat}{3}
        x1&=y1  & \qquad\qquad & \qquad\qquad &      a1&=b1 \label{eq:a} \\
        x2&=y2  & & &      a2&=b2 \label{eq:b} \\
        && \mathclap{\begin{aligned}
         x3&=y3 +a1 -d1 +e5 +a1 -d1 +e5 \\
         a3&=b3
        \end{aligned}}& &
        \label{eq:c}
    \end{alignat}
\end{document}

enter image description here

The centered long third equation version:

\documentclass[a4paper]{article}
\usepackage{mathtools}

\begin{document}
    \begin{alignat}{3}
        x1&=y1  & \qquad\qquad & \qquad\qquad &      a1&=b1 \label{eq:a} \\
        x2&=y2  & & &      a2&=b2 \label{eq:b} \\
        && \mathclap{\begin{gathered}
         x3=y3 +a1 -d1 +e5 +a1 -d1 +e5 \\
         a3=b3
        \end{gathered}}& &
        \label{eq:c}
    \end{alignat}
\end{document}

enter image description here

Best Answer

Related Solutions

[Tex/LaTex] List of equations, including equation contents and caption

[Tex/LaTex] Aligning multiple rows and columns with different number of equations (Align environment)

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