[firedrake] Second derivatives

[Justin Chang]

Hi everyone,

Is it possible to do second derivatives? What I mean by that is things like
div[grad[u]] and grad[grad[u]]. I haven't tried this out yet, but we use
these discretizations a lot for our research, and FEniC's inability to do
this made us sad (although our more major qualms had to do with its
inability to support quads).

Thanks,
Justin
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