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СÀ¼»¨(½ð±Ò+10):¶àл¸ßÊÖÏàÖú£¡·Ç³£¸Ðл£¡£¡ 2010-09-10 16:07:53
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(\frac{\delta (\nabla M_i)^2}{\delta M_i}, N_i) =lim_{t\rightarrow 0}\frac{[\nabla (M_i+t N_i)]^2-[\nabla M_i]^2}{t} =2(\nabla M_i, \nabla N_i) =-2(\nabla^2 M_i, N_i) Then, \frac{\delta (\nabla M_i)^2}{\delta M_i}=-2\nabla^2 M_i |
2Â¥2010-09-02 17:49:00















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