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Oliver Sander authored
The local finite element selection mechanism in RaviartThomasBasis would only work properly if a Raviart-Thomas local finite element of given order and space dimension existed both for cubes and simplices. This is not the case for 3rd-order RT elements in 2d and 2d-order RT elements in 3d: They currently exist for cubes, but not for simplices. This patch makes the element selection logic more flexible, and thereby implements these to new cases.
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