Dear all,
Is it necessary to find the weak formulation always in the vector form for calculating the estimates? Is it possible to work out with individual equations?
Dear,
Try to read the following papers:
https://www.sciencedirect.com/science/article/pii/S0168927409000191
https://www.degruyter.com/view/j/cmam.2006.6.issue-1/cmam-2006-0001/cmam-2006-0001.xml
https://epubs.siam.org/doi/10.1137/0713048
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