**NAME**

div_div-- -grad div operator

**SYNOPSIS**

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

**DESCRIPTION**

Assembly the form associated to thegrad(div(.))operator on the finite element spaceV: / | a(u,v) = | div(u) div(v) dx | / Omega This form is usefull when considering elasticity problem.

**EXAMPLE**

Here is an example of the vector-valued form: geo omega ("square"); space V (omega, "P2", "vector"); form a (V, V, "div_div");