## Patrick Keef and David Guichard

###
Department of Mathematics

Whitman College

This work is licensed under the Creative Commons Attribution-NonCommercial-ShareAlike License. To view a copy of this license, visit http://creativecommons.org/licenses/by-nc-sa/3.0/ or send a letter to Creative Commons, 543 Howard Street, 5th Floor, San Francisco, California, 94105, USA. If you distribute this work or a derivative, include the history of the document.

This text was initially written by Patrick Keef and modified by David Guichard.

This HTML version was produced using a script written by David Farmer and adapted by David Guichard. It is generated from the TeX source; the output of TeX should be treated as the definitive version: http://www.whitman.edu/mathematics/higher_math/higher_math.pdf. Other versions are available at http://www.whitman.edu/mathematics/higher_math/.

Please report problems to guichard@whitman.edu.