Math. 311                                         Spring 2000

                     HOMEWORK SUMMARY REPORT


  Assignment number: 12          
    
  Problem number: 7.5.1  

  Number of papers received: 1 

  Reviewing committee (Greek letter): xi      

  List all participating members: Kyle R. Brady
                                Mason Drew



  Author[s] of paper[s] chosen for publication: [...]  

  Comments:
 ... has a good solution; he just needs to rewrite his explanation at
the bottom to make it more clear.


INSTRUCTOR'S COMMENT:  The grader and I did not think that this paper
reached to the central point of the exercise.  See the Fall '96 solution
or pp. 110-111 of the Schaum's Outline book on Vector Analysis.  Briefly,
the point is that Green's theorem for the 2-dimensional vector field (M,N)
is the same formula as the two-dimensional Gauss's theorem for the vector
field (N,-M); rotating the vector field by 90 degrees this way is
equivalent to replacing the unit tangent vector to the curve by the unit
normal vector.