Algebraic Topology: Homology and Cohomology by Andrew H. Wallace

By Andrew H. Wallace

This self-contained textual content is appropriate for complicated undergraduate and graduate scholars and will be used both after or at the same time with classes commonly topology and algebra. It surveys a number of algebraic invariants: the basic crew, singular and Cech homology teams, and various cohomology groups.

Proceeding from the view of topology as a kind of geometry, Wallace emphasizes geometrical motivations and interpretations. as soon as past the singular homology teams, even though, the writer advances an realizing of the subject's algebraic styles, leaving geometry apart that allows you to research those styles as natural algebra. quite a few workouts seem through the textual content. as well as constructing scholars' considering when it comes to algebraic topology, the routines additionally unify the textual content, when you consider that a lot of them characteristic effects that seem in later expositions. huge appendixes provide invaluable experiences of history material.

Reprint of the W. A. Benjamin, Inc., big apple, 1970 variation.

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Extra info for Algebraic Topology: Homology and Cohomology

Example text

In algebraic terms, for each p, a homomorphism Hp: CC(E) -+ Cp+1(E) should be constructed such that, for a singular simplex on E, dHpo=Ba-a-Hp_1da (1-6) a formula of the same type as that appearing in Theorem 1-16. In Introduction an explicit form is given for H. It is more suitable here to use a different procedure, which will prepare the way for a more general technique to be introduced later. The construction of H will be carried out inductively. fi HQ = Hq fl (1-8) where fl is an induced homomorphism of chain groups corresponding to a continuous map of one space into another.

Definition 1-26. The homomorphism 0: HP(X, Y) -+ HP _ 1(Y, Z) constructed as above is called the boundary homomorphism or homology boundary homomorphism (to emphasize the fact that it operates on homology groups). Note that although the operator d on chains is also a homomorphism it is always called the boundary operator to avoid confusion. An important property of a is that it commutes with homomorphisms induced by continuous maps. This is really just a reflection of the fact that the boundary operator commutes with such homomorphisms (cf.

In particular, the simplexes of maximum dimension in BS correspond to those sequences in which all dimensions appear from 0 up to dim S. 2-6. If K is a complex, let BK denote the set of all simplexes in all BS where S is a simplex of K. Show that the union of simplexes in BK is a complex. Also, if L is a subcomplex of K, show that BL is the subcomplex of BK that is obtained by taking all simplexes of BK lying in the space L. Note that, combining this result with Exercise 2-1, the barycentric subdivision of any complex can be obtained by taking the barycentric subdivision of a simplex and then restricting to a subcomplex.

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