4．2 Some Structure Theory of Categories
4．2．1 Initial and Terminal Objects
4．2．2 Products and Coproducts
4．3 Functors
4．3．1 The Category Cat
4．3．2 Homology and Cohomology Viewed as Functors
4．3．3 Group Actions as Functors
4．4 Limit C0nstructions
4．4．1 Definitioof Colimit of a Functor
4．4．2 Colimits and Infinite Unions
4．4．3 Quotients of Group Actions as Colimits
4．4．4 Limits
4．5 Comma Categories
4．5．1 Objects Below and Above Other Objects
4．5．2 The General Constructioand Further Examples
……
Part Ⅱ Methods of Combinatorial Algebraic Topology
Part Ⅲ Complexes of Graph Homomorphisms
References
Index

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