By Tammo Tom Dieck

ISBN-10: 3037190485

ISBN-13: 9783037190487

This publication is written as a textbook on algebraic topology. the 1st half covers the cloth for 2 introductory classes approximately homotopy and homology. the second one half provides extra complex functions and ideas (duality, attribute sessions, homotopy teams of spheres, bordism). the writer recommends beginning an introductory path with homotopy idea. For this goal, classical effects are provided with new common proofs. however, you can commence extra frequently with singular and axiomatic homology. extra chapters are dedicated to the geometry of manifolds, phone complexes and fibre bundles. a distinct characteristic is the wealthy provide of approximately 500 routines and difficulties. numerous sections contain subject matters that have no longer seemed prior to in textbooks in addition to simplified proofs for a few vital effects. necessities are regular aspect set topology (as recalled within the first chapter), hassle-free algebraic notions (modules, tensor product), and a few terminology from class thought. the purpose of the publication is to introduce complicated undergraduate and graduate (master's) scholars to simple instruments, suggestions and result of algebraic topology. adequate heritage fabric from geometry and algebra is incorporated. A e-book of the eu Mathematical Society (EMS). disbursed in the Americas by way of the yankee Mathematical Society.

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**Additional info for Algebraic Topology (EMS Textbooks in Mathematics)**

**Example text**

Let f W X Y ! Z be continuous. Then the adjoint map f ^ W X ! x; y/ is continuous. Proof. Let K Y be compact and U Z open. K; U / has an open pre-image under f ^ . fxg K/ U . K; U /. 2) we obtain a set map ˛ W Z X Y ! Z Y /X , f 7! f ^ . Let eY;Z be continuous. A continuous map ' W X ! ' idY / W X Y ! Z Y Y ! Z. Z Y /X ! Z X Y , ' 7! ' _ . 3) Proposition. Let eY;Z be continuous. Then ˛ and ˇ are inverse bijections. Thus ' W X Y ! Z is continuous if ' _ W X Y ! Z is continuous, and f W X Y ! Z is continuous if f ^ W X !

X; t / 7! x/ is continuous in both variables simultaneously. We call f and g homotopic if there exists a homotopy from f to g. (One can, of 28 Chapter 2. The Fundamental Group course, define homotopies with Œ0; 1 X . ) The homotopy relation ' is an equivalence relation on the set of continuous maps X ! Y . x; t / 7! x; 1 t / shows g ' f . Let K W f ' g and L W g ' h be given. x; 2t 1/; 12 Ä t Ä 1; and shows f ' h. x/ shows f ' f . The equivalence class of f is denoted Œf and called the homotopy class of f .

N k/ 0 B 0 B respectively. The map A 7! Rn /. 9. Projective Spaces. Rn / is a compact Hausdorff space. It is called the Grassmann manifold of k-dimensional subspaces of Rn . Cn /. Chapter 2 The Fundamental Group In this chapter we introduce the homotopy notion and the first of a series of algebraic invariants associated to a topological space: the fundamental group. Almost every topic of algebraic topology uses the homotopy notion. Therefore it is necessary to begin with this notion. A homotopy is a continuous family h t W X !