Text Formatting ⇒ space in equations

[helllo]

Hi everyone,
I'm trying to type this in latex :
f*g = a
"space" = b + c
(where "space" is real space)

When I do it in latex this way :

Code: Select all

f*g = a \\
          = b + c

I get this :
f*g = a
= b + c

Any idea how to have the second "=" under the first one ?
Thank you

[php1ic]

Hi helllo,

Don't post random bits of code, instead post full a MWE that people can easily compile to see the problem.

For your current question, use the align environment provided by the amsmath package

Code: Select all

\documentclass[a4paper,11pt]{article}

\usepackage{amsmath}

\begin{document}

\begin{align}
f\star g &=a\\
         &=b+c
\end{align}

\end{document}

[helllo]

Thank you !

[helllo]

Hi, is it possible to write a "non-maths" sentence next to one equation when using the align mode ?
like this :

Code: Select all

\documentclass[a4paper,11pt]{article}

\usepackage{amsmath}

\begin{document}

\begin{align}
f\star g &=a (because a>0)\\
         &=b+c
\end{align}

\end{document}

thanks

[Stefan Kottwitz]

Yes, use the \text command:

Code: Select all

\documentclass[a4paper,11pt]{article}
\usepackage{amsmath}
\begin{document}
\begin{align}
f\star g &=a \quad (\text{because }a>0)\\
         &=b+c
\end{align}
\end{document}

Stefan

[gmedina]

Hi,

you can use either the \text or \textrm command and add some space if there's only one annotated line or use another aligning point (to align the annotations):

Code: Select all

\documentclass{article}
\usepackage{amsmath}

\begin{document}

\begin{align}
  f\star g &=a\qquad\text{(because $a>0$)}\\
              &=b+c
\end{align}

\begin{align}
  f\star g &=a & \text{(because $a>0$)}\\
              &=b+c & \text{(because $b=0$)}
\end{align}

\end{document}

[helllo]

thank you very much