Download e-book for iPad: Algebraic Topology: A First Course (Graduate Texts in by William Fulton

By William Fulton

ISBN-10: 0387943277

ISBN-13: 9780387943275

This publication introduces the real rules of algebraic topology via emphasizing the relation of those rules with different components of arithmetic. instead of picking one standpoint of contemporary topology (homotropy conception, axiomatic homology, or differential topology, say) the writer concentrates on concrete difficulties in areas with a couple of dimensions, introducing purely as a lot algebraic equipment as important for the issues encountered. This makes it attainable to determine a greater variety of vital beneficial properties within the topic than is usual in introductory texts; it's also in concord with the historic improvement of the topic. The publication is aimed toward scholars who don't inevitably intend on focusing on algebraic topology.

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Extra resources for Algebraic Topology: A First Course (Graduate Texts in Mathematics, Volume 153)

Example text

There is a version of the prime decomposition for orbifolds, which involves cutting OP along orbifold spheres, namely 2-dimensional orbifolds with positive Euler characteristic. Let S be one such orbifold sphere. In our setting, because the singular locus is a 4-valent graph, S must have an even number of cone points. Since the 1-skeleton of P is connected, the orbifold sphere S must intersect the singular locus, hence must have at least two cone points, with angle . Therefore, since each singular edge has angle , and S has positive Euler characteristic, it must have exactly two cone points.

We are left with a collection of disks W , each lying in S 3 with boundary on the state surface SA and on the link K. Cut along these disks. 8. Each component of MA nnW is homeomorphic to a 3-ball. Proof. Notice there will be a single component above the projection plane. Since we have cut along each region of the projection graph, either by cutting along a soup can or along one of the disks in W , this component must be homeomorphic to a ball. Next, consider components which lie below the projection plane.

Mark an ideal vertex at the center of each segment of HA . Connect these dots by edges bounding white disks, as in Fig. 3. Now we consider the upper 3-ball, or the single 3-ball lying above the plane of projection. Again, ideal edges on this 3-ball will meet at ideal vertices corresponding to strands of the link visible from inside the 3-ball. However, the identification no longer occurs only at single crossings. Still, we obtain the following. 14. The upper 3-ball admits a checkerboard coloring, and all ideal vertices are 4-valent.

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Algebraic Topology: A First Course (Graduate Texts in Mathematics, Volume 153) by William Fulton

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