Hi, I'm confused about Eq 17 of the FEM section of the cyclopedia: https://www.comsol.com/multiphysics/finite-element-method
It seems to me the sum 
does not belong in the last term of eq 17 (going from eq 15). Anyone confer?
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Question about equaton 17 in FEM section of Multiphysics Cyclopedia
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