Introduced the divergence Div(F) of a vector field F. 

<br><br>
 Explained how Green's Theorem in the plane can be written as Stokes' formula for p=1 and two variables x,y and a simply connected region S in the plane.

<br><br>
 Explained how Stokes' Theorem from "Advanced Calculus" can be written as Stokes' formula for p=1 and a simply connected region S on a surface.

<br><br>
 Explained how the Divergence Theorem can be written as Stokes' formula for p=2 and three variables x,y,z and a region S on a 3-dimensional Euclidean space..