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div_div: -grad div operator


div_div - -grad div operator


form (const space V, const space& V, "div_div");


Assembly the form associated to the grad(div(.)) operator on the finite element space V: / | a(u,v) = | div(u) div(v) dx | / Omega This form is usefull when considering elasticity problem.
Here is an example of the vector-valued form: geo omega ("square"); space V (omega, "P2", "vector"); form a (V, V, "div_div"); DIV_DIV(7)

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