Corrected term paper problem set

A corrected version has been uploaded. If you are not sure you have the right one: the filename ends with 17c.pdf (the "c" for corrected).

The error was that f(x,y) in problem 1, is not equal to w-14, but to y w(x,y) - 14. The missing "y" has been inserted. 

My apologies for the inconvenience. Nils.