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davidam: ½ð±Ò+50, ¡ï¡ï¡ïºÜÓаïÖú 2015-12-26 14:13:12
The naive way is to let l =2. And write each term out and combine to get a matrix expression. To image too complicated thing might be difficult. Good luck

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zaq123321

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The last but one equality seems not correct.  For example, let l=2. The last but two line is a number. But the last but one line is not a number.
Since P is 2x1, a is 2x1, it's not a number anymore.
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