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they are correct

Posted by frkstyc at 2006-08-27 15:59:24 on Problem 2988
In Reply To:in 4th expression, x_i_k is mistake? Posted by:scudjh at 2006-08-27 15:57:15 
> I think, x_i_k => x_k is correct.
> 
> What about you?
>
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