# How to center an equation at the center of one column in a two-column paper

In a two columns paper, how can I center an equation to the center of one column? Originally, what I have is:

$$y = ax$$


But this fits the equation to stay, as normal text, at the left side of the column.

EDIT: I think, better than the MWE, is the link to this class, which I am using.

• It would be helpful if you composed a fully compilable MWE including \documentclass and the appropriate packages that sets up the problem. While solving problems can be fun, setting them up is not. Then, those trying to help can simply cut and paste your MWE and get started on solving the problem. Furthermore the answer may depend on the packages that you are using. – Peter Grill Sep 26 '14 at 2:12
• Can't reproduce your claim with a two-column article class. So a suitable MWE would help greatly. – Mike Renfro Sep 26 '14 at 2:13
• You should test, if this problem exists only with your special class. And we still need an MWE. We do not like external links without even knowing if we have to download something. In case, an MWE with \documentclass{article} works as well, it would save as a lot of time. – LaRiFaRi Sep 26 '14 at 5:40
• equation centres by default but many classes have a fleqn option to set equations flush left, sounds like that is in operation in your case. – David Carlisle Sep 26 '14 at 9:05

\LoadClass[fleqn]{article}

• @Py-ser yes fleqnis for flush left, ie not centred equations. – David Carlisle Sep 28 '14 at 8:56