Math & Science ⇒ eqnarray + lines of text?

[lb5962]

hey sorry to write something completely slightly irrelevent but I can't find out how to start a new thread (can anyone send me a link?).

Ok my problem is about aligning also...

Basically I want to be able to allign certain things up: I want the equation:

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\alpha:X\times G\rightarrow X

to be aligned directly above

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(x,g)\mapsto (x,g)\alpha=x\bullet g

with the

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\rightarrow

arrow DIRECTLY above the

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\mapsto

arrow.

Can anyone help me?

Thanks

[gmedina]

Hi,

you can use the align (or align*) environment provided by the amsmath package, as the following example suggests:

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\documentclass{article}
\usepackage{amsmath}

\begin{document}

\begin{align*}
  \alpha:X\times G &\rightarrow X\\
  (x,g) &\mapsto (x,g)\alpha=x\bullet g
\end{align*}

\end{document}

Basic documentation on typesetting math can be found here:
amsmath user guide
Mathmode document

Regarding the new topic issue, once you enter a subforum, you will find right below its name a "new topic" button. Pressing that button you can create a new thread.