Chapter 5 Deconstructionist Topology

16. What is Topology? - Revisited
      The Space Builder's Toolkit.
17. Disjoint Unions
     (Section 4 of Martin Crossley's notes)*
18. Notes on Products
19. Pushing out and Pulling Back Topologies
20. Notes on Quotients
21. Quotient Spaces
     (Section 4 of Martin Crossley's notes)*