February 1, 2013 - The Cohomology Theory document has been reformatted for greater readability.

February 11, 2012 - Slowly I'm working through Algebraic Topology by Allen Hatcher, and while occasionally I'll work out an exercise in the book, lately my efforts have been more in the direction of reorganizing content and adding details which I hope to be of use to myself and others in the future. In time these efforts may amount to something that could be called a book in its own right, available for free to anyone interested. Currently some of the links at left below work. Material addressing covering spaces and homotopy theory is not yet available, and the future document "Some Algebra" will cover basic group theory, free products and free groups, group presentations, and free abelian groups. Some homological algebra will be covered as part of the chapter on Homology Theory, and some category theory will be incorporated (someday) into the chapter on Cohomology Theory. Finally, there is an old paper about the Wirtinger presentation that may be good for a chuckle.