Math & Science ⇒ How to left align some formulas?

[ks-zadeh]

How can I "left align" (parindent) one or more, but not all, formulas in a manuscript? That is, by avoiding general commands like "fleqn" and the like.

[localghost]

Code: Select all

\documentclass[11pt,a4paper,english]{article}
\usepackage[T1]{fontenc}
\usepackage[utf8]{inputenc}
\usepackage{babel}
\usepackage{mathtools}   % Loads »amsmath«
\usepackage{blindtext}


\begin{document}
  \blindtext
  \begin{align}
    (a+b)^2 &= a^2+2ab+b^2 \\
    (a-b)^2 &= a^2-2ab+b^2 \\
    (a+b)(a-b) &= a^2-b^2
  \end{align}

  \blindtext
  \begin{flalign}
    (a+b)^2 &= a^2+2ab+b^2 & \\
    (a-b)^2 &= a^2-2ab+b^2 & \\
    (a+b)(a-b) &= a^2-b^2 &
  \end{flalign}

  \blindtext
\end{document}

Regarding the indentation of the second equation system I can't advice.


Best regards
Thorsten

[ks-zadeh]

Sorry, it seems I have not stated my problem clearly. What I would like to obtain is this: to have, deliberately, one or another of my formulas start at the left hand side of the line where the paragraph indent is. Is there a special, optional command that one can add to equation, eqnarray, gather, etc. to obtain that result?

[frabjous]

Perhaps a modification of the above approach would suit your needs, e.g., for a one-liner:

Code: Select all

  \begin{flalign}
      \indent & (a+b)^2 = a^2+2ab+b^2 &
  \end{flalign}

[ks-zadeh]

It seems your proposal works for equations only, but not for formulas in general. For example, I want to left align (with indent) an n-tuple like the following one:

\langle \Omega, \mathcal{E}, p, T, A_{t_{1}}, B_{t_{2}}, X \rangle

Using your proposal it is centered.

[gmedina]

Hi,

you could try the fleqn environment provided by the nccmath package. A little example:

Code: Select all

\documentclass{article}
\usepackage{amsmath}
\usepackage{nccmath}

\begin{document}

text text text text text  text text text text text text text text text text text text text text text text text text text text text text text text text text text text text text text text text text text text text text text text text text text text text text text text text text text
\begin{fleqn}[\parindent]
  \begin{align}
    a &= b \\
    &= c\\
    &= d.
  \end{align} 
\end{fleqn}
text text text text text  text text text text text text text text text text text text text text text text text text text text text text text text text text text text text text text text text text text text text text text text text text text text text text text text text text text
\begin{fleqn}[\parindent]
  \begin{equation}
    \langle \Omega, \mathcal{E}, p, T, A_{t_{1}}, B_{t_{2}}, X \rangle
  \end{equation} 
\end{fleqn}

\end{document}

[ks-zadeh]

Using the latter proposal still centers the formulas. But the preceding proposal works. I discovered that initially I had made a mistake. My problem has been resolved. Thank you all!

[gmedina]

Using the latter proposal still centers the formulas. But the preceding proposal works. I discovered that initially I had made a mistake. My problem has been resolved. Thank you all!

Eh? The fleqn environment doesn't center formulas. Did you compile my example code?

[ks-zadeh]

My problem found a solution by following proposal:

\begin{flalign}
\indent & (a+b)^2 = a^2+2ab+b^2 &
\end{flalign}

plus gmedina's proposal. The latter one seems to be better.

[localghost]

Now that the problem is solved, please be so kind and mark the topic accordingly as clearly written in Section 3 of the Board Rules. Please keep that in mind for the future so that further reminders will not be necessary any more.