[petsc-users] Modified Taylor-Hood elements with piece-wise constant pressure for Stokes equation

[Lawrence Mitchell]

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On 02/06/15 16:40, Jed Brown wrote:
> Lawrence Mitchell <lawrence.mitchell at imperial.ac.uk> writes:
>> So-called "enriched" elements in FEniCS are not created with a
>> nodal basis, instead te "basis" for the space Q + P is just the 
>> concatenation of the bases for Q and P separately and so
>> tabulation of basis functions at points is just the
>> concatentation of the tabulation of Q and that of P.
> 
> So the mass matrix for CG1+DG0 is singular?

I believe so, yes.

Lawrence
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