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tom.stoer
#2
Jan17-12, 12:57 AM
Sci Advisor
P: 5,369
you could start with an example like

[tex]\frac{\partial}{\partial x_i}\text{exp}\left[-\frac{1}{2}\,x_m\,A_{mn}\,x_n\right][/tex]

with a symmetric matrix A and a sum over indices m,n