Kronecker Delta and vector form of q_(i,j) q_(m,mj)

by Romik
Tags: divergence, gradient, index notation, kronecker delta, vector form
Romik is offline
Dec5-12, 03:18 PM
P: 13

we know ∇q=qi,j and ∇ ∇.q=qi,ij

but what will happen if we have qi,jqm,mj ? (sum on j)

I know some terms of ∇q∇ ∇.q will drop due to that summation. so the question is what is the right expression in vector form for that term.

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