Issue on weak form of dynamic elasticity problem in the step-18 tutorial program

[Ming Yang]

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.

[Wolfgang Bangerth]

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: bang...@colostate.edu
www: http://www.math.colostate.edu/~bangerth/