K. N. P. Singh 
Concepts in Algebraic Topology 

Algebraic topology is a branch of mathematics which uses tools from abstract algebra to study topological spaces. The basic goal is to find algebraic invariants that classify topological spacesup to homeomorphism, though usually most classify up to homotopy equivalence. Although algebraic topology primarily uses algebra to study topological problems, using topology to solve algebraic problems is sometimes also possible. Algebraic topology, for example, allows for a convenient proof that any subgroup of a free group is again a free group. An older name for the subject was combinatorial topology, implying an emphasis on how a space X was constructed from simpler ones. The basic method now applied in algebraic topology is to investigate spaces via algebraic invariants by mapping them, for example, to groups which have a great deal of manageable structure in a way that respects the relation of homeomorphism of spaces. The objective of this book is to provide guidelines for students to understand the topic. Contents: Structural Topology . Concepts in Graph Theory . Concepts in Complex Variable . Basic Binary Relation . Graph Connectivity . Graph Embedding Basics . Composition of Functions.