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The equation I want to display is too long to put in one column, so I prefer to make it in the whole two columns like the following format of equation(47) enter image description here

including the two lines above and under equation (47). Thank you for your assistance.

marked as duplicate by touhami, Werner, Jesse, user13907, Ruben Aug 7 '15 at 8:50

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    please add a minimal working example of your code we need to know the documentclass ... – touhami Aug 7 '15 at 4:36
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    Welcome to TeX.SX! Does Fitting unbreakable large equation on one line in a twocolumn layout help? – Adam Liter Aug 7 '15 at 4:36
  • Adding to those answers: You could also use a widetext - environment around your equation. I think its the go-to way for some journals (i.e. using revtex). This will result in slightly different separating lines, I dont know if thats important to you. – Bort Aug 7 '15 at 7:22
  • Thanks, Adam, It really what I want. By the way, do you know how to draw these two separate lines as shown above? – Dan Aug 7 '15 at 16:40
  • @Bort, unfortunately, I am writing a paper submitted to IEEE, where widetext is not compatible with IEEEtrans. – Dan Aug 8 '15 at 16:12

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