Math & Science ⇒ add descriptions to each line of a multiline equation?

[pythonscript]

I'm using eqnarray to create multi line equations that show the steps of a problem, but I'm wondering how I can add descriptions to the ends of those lines? I've been using eqnarray* on and off to suppress/add labels, but adding a short text description, non math mode, to the right side of each line in the eqnarray would be really helpful.

Thanks for the help!

[gmedina]

Hi,

don't use eqnarray anymore (read Avoid eqnarray!). In its stead you can use align or some other environment from amsmath. Try something like this:

Code: Select all

\documentclass{article}
\usepackage{amsmath}

\begin{document}

\begin{align*}
  a(b + c) &= ab + ac && \text{(por distributividad)}\\
  &= ba + ca && \text{(por conmutatividad)}\\
  &= (b + c)a && \text{(por distributividad)}
\end{align*}

\end{document}

[pythonscript]

Thank you! That was extremely helpful and exactly what I was looking for.

[localghost]

Now that the problem is obviously solved, please be so kind and mark the topic accordingly as clearly written in Section 3 of the Board Rules (to be read before posting).


Best regards and welcome to the board
Thorsten