On 9/8/22 04:40, Abbas wrote:

I want the average of (uu) which is = u1*u1/2 +u2*u2/2 but I don't know how to get it.

Do I understand right that u1 and u2 are vectors, and when you say
  u1 * u1
you mean the outer product of a vector with itself, forming a tensor?

Best
 W.

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Wolfgang Bangerth          email:                 bange...@colostate.edu
                           www: http://www.math.colostate.edu/~bangerth/

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