MAS61015 Algebraic Topology Contents 1 Introduction 2 The idea of homology 3 Topological spaces 4 Homeomorphism 5 Paths 6 Interlude on categories and functors 7 Constructing new spaces 8 The Hausdorff property, and compactness 9 Homotopy 10 Homology 11 Homology of the punctured plane 12 Abelian groups 13 Chain complexes and homology 14 Chain homotopy 15 Homology of spheres 16 Applications of homology 17 The Snake Lemma 18 Subdivision 19 Construction of the Mayer-Vietoris sequence 20 Further calculations 21 The Jordan Curve Theorem 22 Covering maps 23 Transfers, coefficients and homology of projective spaces 24 Borsuk-Ulam and related results