Curl of a vector field and the Green's theorem

Description
The curl of a vector field is defined. In what conditions the curl of a vector field is zero is discussed. The conditions required for Green's theorem are introduced by Prof. Denis Auroux. The application of this theorem is shown through some practical problems.
Prof. Denis Auroux, Maths, Fall 2007,18.02 Multivariable Calculus: 22: Green's Theorem, Massachusetts Institute of Technology: MIT OpenCourseWare),http://ocw.mit.edu (Accessed September 28,2011). License: Creative Commons BY-NC-SA:http://ocw.mit.edu/terms/#cc