By Jean H Gallier; Dianna Xu

This welcome boon for college students of algebraic topology cuts a much-needed significant course among different texts whose therapy of the type theorem for compact surfaces is both too formalized and complicated for these with out targeted heritage wisdom, or too casual to have the funds for scholars a complete perception into the topic. Its committed, student-centred procedure info a near-complete evidence of this theorem, broadly favorite for its efficacy and formal good looks. The authors current the technical instruments had to set up the tactic successfully in addition to demonstrating their use in a essentially dependent, labored instance. learn more... The category Theorem: casual Presentation -- Surfaces -- Simplices, Complexes, and Triangulations -- the basic team, Orientability -- Homology teams -- The type Theorem for Compact Surfaces. The type Theorem: casual Presentation -- Surfaces -- Simplices, Complexes, and Triangulations -- the basic team -- Homology teams -- The class Theorem for Compact Surfaces

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

**Example text**

1/ D a, under the multiplication operation, Œ 1 Œ 2 D Œ 1 2 , induced by the composition of closed paths based at a. One actually needs to prove that the above multiplication operation is associative, has the homotopy class of the constant path equal to a as an identity, and that the inverse of the homotopy class Œ is the class Œ 1 . 2 2t/ if 0 Ä t Ä u=2I if u=2 Ä t Ä 1 if 1 u=2I u=2 Ä t Ä 1: For details, see Massey [6] or Munkres [8]. As defined, the fundamental group depends on the choice of a base point.

Given a normed affine space E , for any nonempty convex set C , the topological closure C of C is also convex. Furthermore, if C is bounded, then C is also bounded. 3. The following proposition shows that topologically closed, bounded, convex sets in An are equivalent to closed balls. We will need this proposition in dealing with triangulations. 2. If C is any nonempty bounded and convex open set in An , for any point a 2 C , any ray emanating from a intersects @C D C C in exactly one point. Furthermore, there is a homeomorphism of C onto the (closed) unit ball B n , which maps @C onto the n-sphere S n 1 .

153–220 4. W. von Dyck, Beitr¨age zur analysis situs. Mathematische Annalen 32, 457–512 (1888) 5. M. Fr´echet, K. Fan, Invitation to Combinatorial Topology, 1st edn. (Dover, New York, 2003) 6. D. Hilbert, S. Cohn–Vossen, Anschauliche Geometrie, 2nd edn. (Springer, New York, 1996) 7. D. Hilbert, S Cohn–Vossen, Geometry and the Imagination (Chelsea, New York, 1952) 8. C. Jordan, Sur la d´eformation des surfaces. J. de Math´ematiques Pures et Appliqu´ees 2e s´erie 11, 105–109 (1866) ¨ 9. F. Klein, Uber Riemanns Theorie der Algebraischen Funktionen und Ihrer Integrale, 1st edn.