# variational/indicial notation question

by inprincipio
Tags: notation
 P: 1 Dear All, Not sure I'm posting in the correct subforum here, but I'm wondering if anyone can help me understand how to expand the following: δui,j(δim+ui,m) I can't quite get to grips with the indicial notation in the example, the δui,j is the variation of u (displacement in this example) and the δim is the kronecker delta.. I just want to expand the brackets, can anyone offer any advice on how to do this. Many thanks

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