By Martin Arkowitz

This is a booklet in natural arithmetic facing homotopy conception, one of many major branches of algebraic topology. The primary themes are as follows:

• simple homotopy;

• H-spaces and co-H-spaces;

• Fibrations and cofibrations;

• precise sequences of homotopy units, activities, and coactions;

• Homotopy pushouts and pullbacks;

• Classical theorems, together with these of Serre, Hurewicz, Blakers-Massey, and Whitehead;

• Homotopy units;

• Homotopy and homology decompositions of areas and maps; and

• Obstruction thought.

The underlying subject matter of the total booklet is the Eckmann-Hilton duality idea. This process offers a unifying motif, clarifies many thoughts, and decreases the quantity of repetitious fabric. the subject material is handled rigorously with recognition to aspect, motivation is given for plenty of effects, there are a number of illustrations, and there are loads of routines of various levels of hassle.

It is thought that the reader has had a few publicity to the rudiments of homology conception and primary workforce thought; those subject matters are mentioned within the appendices. The publication can be utilized as a textual content for the second one semester of an algebraic topology path. The meant viewers of this publication is complicated undergraduate or graduate scholars. The booklet may be utilized by somebody with a bit history in topology who needs to benefit a few homotopy theory.

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**Additional info for Introduction to Homotopy Theory**

**Example text**

Let X be an unbased space with subspace A ❸ X and let g : A Ñ Y be a function. If there exists a continuous, unbased function f : X Ñ Y such that f ⑤A ✏ g, then f is called an extension of g and g is said to be extendible to X. This gives a diagram / q8 Y, q q i q qf q q X A g where i is the inclusion function and f is an extension (which may or may not exist). If we put mild restrictions on A and X, such as requiring that the pair ♣X, Aq be a relative CW complex, then the following result holds.

6 If ♣Y, mq and ♣Y ✶ , m✶ q are H-spaces and h : ♣Y, mq Ñ ♣Y ✶ , m✶ q an H-map, then h✝ : rX, Y s Ñ rX, Y ✶ s is a homomorphism of based sets with a binary operation. In particular, if Y and Y ✶ are grouplike spaces, then h✝ : rX, Y s Ñ rX, Y ✶ s is a group homomorphism. Proof. Let ras, rbs rX, Y s; then h♣a bq ✏ hm♣a ✂ bq∆ ✔ m✶ ♣h ✂ hq♣a ✂ bq∆ ✏ ha hb. Therefore h✝ is a homomorphism. 1. 2, we regard X ❴ X ❸ X ✂ X so that every element of X ❴ X is of the form ♣x, ✝q or ♣✝, x✶ q, for x, x✶ X.

Since RP0 is a point t✝✉, set X 0 ✏ t✝✉. Now assume that the CW structure has been defined on RPk✁1 . Define a characteristic function Φ : ♣E k , S k✁1 q Ñ ♣RPk , RPk✁1 q as the composition k k of the homeomorphism E k❛✕ E with the quotient function E Ñ E k ④✒ k k ✕ RP . Then Φ♣xq ✏ ①x, 1 ✁ ⑤x⑤2②, for x E , where ①✁② denotes the k equivalence class in E . Hence Φ⑤E k ✁ S k✁1 : E k ✁ S k✁1 Ñ RPk ✁ RPk✁1 is a homeomorphism with inverse function Ψ : RPk ✁ RPk✁1 Ñ E k ✁ S k✁1 defined by Ψ ①x1 , x2 , .