# 2-D Divergence theorem

3 videos
Using Green's theorem (which you should already be familiar with) to establish that the "flux" through the boundary of a region is equal to the double integral of the divergence over the region. We'll also talk about why this makes conceptual sense.

### Constructing a unit normal vector to a curve

VIDEO 10:08 minutes
Figuring out a unit normal vector at any point along a curve defined by a position vector function

### 2D divergence theorem

VIDEO 14:44 minutes
Using Green's Theorem to establish a two dimensional version of the Divergence Theorem

### Conceptual clarification for 2D divergence theorem

VIDEO 9:28 minutes
Understanding the line integral as flux through a boundary