On 7/13/20 7:38 AM, Praveen C wrote:
You were right, this happens for degree >= 2
See the discussion in Section 1.2 here
https://www.math.purdue.edu/~zhan1966/research/paper/superconvergence.pdf
<https://nam01.safelinks.protection.outlook.com/?url=https:%2F%2Fwww.math.purdue.edu%2F~zhan1966%2Fresearch%2Fpaper%2Fsuperconvergence.pdf&data=02%7C01%7CWolfgang.Bangerth%40colostate.edu%7C48c31868f9844d7e6e5c08d827321e75%7Cafb58802ff7a4bb1ab21367ff2ecfc8b%7C0%7C1%7C637302443507240168&sdata=VqrErQTBylXc7ceblfcvciT2FQOKFRoFOkHIIJGGXLA%3D&reserved=0>
and it gives many references.
Nice, I didnt know this.
Neither did I know the requirement k>=2. Thanks a lot for figuring this out --
I've extended the discussion in step-7 here
https://github.com/dealii/dealii/pull/10703
and in particular added the reference you found!
Thanks for following this question and helping us improve the documentation!
Thanks also for allowing me to learn something new!
Best
W.
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