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Gradients and Laplacian

The gradients and laplacian of the logarithm of three-body term are given by:
$\displaystyle \vec{\nabla}_k \ln U = \sum_{j}\sum_{m , n} \lambda_{mn} \vec{\nabla}_k \phi_m(r_k) \phi_n(r_j)$     (B.27)
$\displaystyle \nabla^2_k \ln U = \sum_{j}\sum_{m , n} \lambda_{mn} \nabla^2_k \phi_m(r_k) \phi_n(r_j)$     (B.28)



Claudio Attaccalite 2005-11-07