By Brian H Bowditch

ISBN-10: 4931469353

ISBN-13: 9784931469358

This quantity is meant as a self-contained creation to the elemental notions of geometric workforce idea, the most principles being illustrated with a variety of examples and workouts. One aim is to set up the rules of the idea of hyperbolic teams. there's a short dialogue of classical hyperbolic geometry, in order to motivating and illustrating this.

The notes are in accordance with a direction given by way of the writer on the Tokyo Institute of expertise, meant for fourth yr undergraduates and graduate scholars, and will shape the foundation of an analogous path somewhere else. Many references to extra subtle fabric are given, and the paintings concludes with a dialogue of assorted parts of modern and present research.

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19. 3. 20. Let X be an n-dimensional based CW complex consisting of an n-cell en attached to the ♣n ✁ 1q-skeleton with characteristic map Φ : ♣E n , S n✁1 q Ñ ♣X, X n✁1 q and let x0 ✏ Φ♣0q. Show that X n✁1 ❸ X ✁ tx0 ✉ is a strong deformation retract. Generalize this to an arbitrary based n-dimensional CW complex. 21. 4 and X n ✏ X for some n. 22. Let K be a CW complex, not necessarily path-connected. 1. Prove that if L is a subcomplex of K, then L is a closed subset of K. 2. Prove that the path components of K are subcomplexes of K.

In this case, it is customary to write m♣y, y ✶ q as yy ✶ and i♣y q as y ✁1 . A grouplike space is thus the analogue of a group in homotopy theory. Similarly an H-map is the analogue of a homomorphism of groups. 3 of spaces that are grouplike, but not topological groups. For now we note that the spheres S 1 , S 3 , and S 7 are all H-spaces. The first two are in fact topological groups. Multiplication of complex numbers induces a multiplication on S 1 which makes it into a topological group and quaternionic multiplication does the same for S 3 .

But a compact discrete space is finite. Hence we conclude that C is contained in a finite union of open cells. ❭❬ If en is an open cell of a CW complex, then the closed cell e¯n is compact. It then follows from the previous lemma that e¯n is contained in a finite union of open cells. This is called the closure–finite condition. 4(2). We now have the following result. 7 Let X be a CW complex and f : X Ñ Y a function. Then f is continuous ðñ f ⑤e¯nβ : e¯nβ Ñ Y is continuous for each closed cell e¯nβ ðñ f Φnβ : Eβn Ñ Y is continuous, for each characteristic map Φnβ .

### A course on geometric group theory by Brian H Bowditch

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