Figure 3.7: Infinitesimal Element for the Evaluation of the Divergence closest to the origin as located at x, then the contribution (from Eq. 3.10) of the two surfaces with normal vectors ei and —ei is lim l axi,axI,ax3^0 Ax1Ax2Ax3 J axiax3


^i^zi"^^0 Ax2Ax3j Ax2Ax3

hence, we can generalize

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