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How to code a special equation?

PostPosted: Sat Jun 14, 2014 4:39 am
by valeriahu
How can I code the equation below?
The equation is displayed in the picture.
Image
Thanks a lot for your attention and kindness!

Re: How to code a special equation?

PostPosted: Sun Jun 15, 2014 11:35 am
by jpfeifer
There is no image here. Try attaching a pdf.