By Jean H Gallier; Dianna Xu

ISBN-10: 3642343643

ISBN-13: 9783642343643

This welcome boon for college kids of algebraic topology cuts a much-needed valuable course among different texts whose therapy of the type theorem for compact surfaces is both too formalized and complicated for these with out distinct history wisdom, or too casual to find the money for scholars a finished perception into the topic. Its committed, student-centred method information a near-complete facts of this theorem, broadly favorite for its efficacy and formal attractiveness. The authors current the technical instruments had to installation the tactic successfully in addition to demonstrating their use in a basically established, labored instance. learn more... The class Theorem: casual Presentation -- Surfaces -- Simplices, Complexes, and Triangulations -- the elemental team, Orientability -- Homology teams -- The type Theorem for Compact Surfaces. The type Theorem: casual Presentation -- Surfaces -- Simplices, Complexes, and Triangulations -- the elemental team -- Homology teams -- The class Theorem for Compact Surfaces

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**Additional resources for A guide to the classification theorem for compact surfaces**

**Sample text**

Let a and b be any two distinct base points. Since E is arcwise connected, there is some path ˛ from a to b. Then, to every closed path based at a corresponds a closed path 0 D ˛ 1 ˛ based at b. E; a/ ! E; b/. E; b/ ! E; a/. E; b/ are isomorphic. E; b/ are isomorphic for any two points a; b 2 E. Remarks. E; a/ ! E; b/ is not canonical, that is, it depends on the chosen path ˛ from a to b. E; a/ is not commutative. E/. E; a/. n However, we won’t have any use for the more general homotopy groups.

2 The Winding Number of a Closed Plane Curve 43 Fig. ti / z0 it is immediately verified that jwi 1j < 1, and thus, wi has a positive real part. cos Âi C i sin Âi /, where i > 0. 0/ z0 D 1; z0 P and the angle Âi is an integral multiple of 2 . Thus, for every subdivision of Œ0; 1 into intervals Œti ; ti C1 such that jwi 1j < 1, with 0 Ä i Ä n 1, we define the winding number, n. ; z0 /, or index, of with respect to z0 , as n. 3 shows a closed path and the winding numbers with respect to the nodes located where these winding numbers are shown.

1; u/ D b; for all u 2 Œ0; 1. In this case, we say that 1 and homotopic) and this is denoted by 1 2. 1 The Fundamental Group 39 γ1 Fig. 2 A path homotopy between 1 and 2 a b γ2 Given any two continuous maps f1 W X ! Y and f2 W X ! Y between two topological spaces X and Y , a map F W X Œ0; 1 ! t/; for all t 2 X . We say that f1 and f2 are homotopic, and this is denoted by f1 ' f2 . t; u/ from a to b, giving a deformation of the path 1 into the path 2 , and leaving the endpoints a and b fixed, as illustrated in Fig.