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Dear all

It can work well after modification. Thank gmedina alot for your warm help.

Hi all,

Thanks very much for intuitive examples. I tried and got the folowing error:
! Misplaced \noalign.
\hline ->\noalign
If I remove \hline, it works well and has no separate line. Can anybody help me!! Thanks very much.

Thanks for all replies.
@fatra2: I want to present my paper similar to the example in attached picture. I means It includes horizon line and long math, numbered equations.
@gmedina: I have tried muticol package with my current document class IEEEtran.cls, but it still doesn't work corectly ...

Dear all,
I am going to prepare a paper. However, I meet a problem of presenting very long math formula in 2-column mode the same as example in this attachment. Please, somebody tell me how. I greatly appriciate for your helps.