Algebraic Topology

Pictures and animated diagrams (generated by Mathematica)
 The plane
 The sphere
 The torus
 The Möbius strip
 The projective plane
 Curves in a plane region
 Curves in the complement of a circle
 Path lifting
 Odds and ends
Problem sets and solutions
 Problem set 1 and solutions
 Problem set 2 and solutions
 Problem set 3 and solutions
 Problem set 4 and solutions
 Problem set 5 and solutions
 Problem set 6 and solutions
 Problem set 7 and solutions