---
name: "div_div"
section: "3rheolef"
platform: "linux"
package: "librheolef-dev"
version: "6.1-2.1"
release: "Debian 7 (Wheezy)"
platforms: ["linux"]
url: "https://new.carta.tech/div_div"
---

# div\_div(3rheolef)

## NAME

**div\_div** -- -grad div operator

## SYNOPSIS

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

```

## DESCRIPTION

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.

## EXAMPLE

Here is an example of the vector-valued form:

```
        geo omega ("square");
        space V (omega, "P2", "vector");
        form  a (V, V, "div_div");

```