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4Â¥: Originally posted by Gravitino at 2014-11-27 05:22:20
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zhouwensmile: ½ð±Ò+2, ¡ïÓаïÖú, thanks 2014-11-27 22:08:33
It seems to me only the first equality of the second derivation makes sense.

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I remember g_ij=inner product of gi and gj. The g^ij matrix is the inverse matrix of matrix g_ij.

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zhouwensmile: ½ð±Ò+8, ¡ï¡ï¡ï¡ï¡ï×î¼Ñ´ð°¸, Ê®·Ö¸Ðл£¡ 2014-11-27 22:08:16
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