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## Main Question or Discussion Point

Hi,

Does anyone know how this integral is calculated

[tex]\int[dx] x_i x_j \exp \{ - (\frac{1}{2} \sum_{rs} A_{rs}x_r x_s+\sum_r L_r x_r ) \}[/tex]

Thanks

Does anyone know how this integral is calculated

[tex]\int[dx] x_i x_j \exp \{ - (\frac{1}{2} \sum_{rs} A_{rs}x_r x_s+\sum_r L_r x_r ) \}[/tex]

Thanks