Is there is a way to modify the behaviour of the
$$ .... $$ display math in order to make automatic line breaking? I am aware of the
breqn package, but to use it I would need to retype all the equations in all the documents and that is a lot of work.
I need the
breqn package, or a similar functionality, because I am switching all my documents to two column format, which I find it a lot more readable (I suppose it has something to do with age). The problem is that there are lots of equations which do not fit in the shorter line and the result is terrible. In addition when you are writing it is difficult to think where the line-breaking should go, so, for to my needs, it is better to leave LaTeX the decision of where to break and later correct manually when needed.
Thanks for your help.