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June 22, 2020, 13:23	Identity - proof	#1
RFA_LS New Member Rodrigo Join Date: Mar 2020 Posts: 9 Rep Power: 6	Hello everyone, I was reading Batchelor's papper: The stress system in a suspension of force-free particles. I came across this identity: $\int\frac{\partial u_i}{\partial x_j}dV=\int u_in_j dA$ Does anyone know how to demonstrate?

June 22, 2020, 17:13		#2
Eifoehn4 Senior Member - Join Date: Jul 2012 Location: Germany Posts: 184 Rep Power: 13	https://en.m.wikipedia.org/wiki/Dive...eneralizations Under section generalizations you may find some references. Regards RFA_LS and aero_head like this. __________________ Check out my side project: A multiphysics discontinuous Galerkin framework: Youtube, Gitlab. Last edited by Eifoehn4; June 22, 2020 at 23:42.

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