On 12/6/19 10:19 AM, Ming Yang wrote:
> Hi. I was trying to derive the weak form of the time discretized dynamic 
> elasticity problem in the step-18 tutorial program. However, I found one 
> mismatch between my solution and the posted one. The procedure has been 
> attached as a pdf file. Please feel free to take a look and correct me 
> if I am wrong. Thanks.

No, you're completely correct. I've fixed this here:
https://github.com/dealii/dealii/pull/9149
I've taken the liberty of crediting you with the fix!

Thanks for reporting!

Best
  W.

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Wolfgang Bangerth          email:                 [email protected]
                            www: http://www.math.colostate.edu/~bangerth/

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