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Algebraic Methods in Unstable Homotopy Theory by Joseph Neisendorfer

By Joseph Neisendorfer

The main glossy and thorough therapy of volatile homotopy idea to be had. the point of interest is on these tools from algebraic topology that are wanted within the presentation of effects, confirmed via Cohen, Moore, and the writer, at the exponents of homotopy teams. the writer introduces a number of points of risky homotopy thought, together with: homotopy teams with coefficients; localization and finishing touch; the Hopf invariants of Hilton, James, and Toda; Samelson items; homotopy Bockstein spectral sequences; graded Lie algebras; differential homological algebra; and the exponent theorems about the homotopy teams of spheres and Moore areas. This ebook is acceptable for a direction in risky homotopy idea, following a primary direction in homotopy conception. it's also a beneficial reference for either specialists and graduate scholars wishing to go into the sector.

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Example text

For finit abelian T , there is a natural isomorphism T ∗ ∼ = Ext(T, Z). Let G be a finitel generated abelian group and let P n (G) be a finit complex with exactly one nonzero reduced integral cohomology group, k H (P n (G); Z) = G 0 for k = n for k = n. 5. If G = T ⊕ F where T is finit abelian and F is finitel generated free abelian, then the reduced integral homology of P n (G) is  ∗  T if k = n − 1, n H k (P (G); Z) ∼ = F ∗ if k = n, and   0 if k = n, n − 1. We will leave the question of the uniqueness of the homotopy type of P n (G) to the exercises.

The homotopy commutative diagram of cofibratio sequences is a good way to see the effect of ρ, η, and β on integral chains. For example, P n (Z/kZ) has a basis of integral chains: 1 in dimension 0, sn −1 in dimension n − 1, en in dimension n. If we look at S n −1 ↓k → − 1 S n −1 ↓k S n −1 ↓ → − S n −1 ↓ ρ → P n (Z/k Z) P n (Z/kZ) − we see immediately that ρ∗ (sn −1 ) = sn −1 , ρ∗ (en ) = en . Similarly, it is not hard to verify the commutative diagram S n −1 ↓k S n −1 ↓ k → − 1 → − η S n −1 ↓ S n −1 ↓ → P n (Z/ Z) P n (Z/k Z) − and thus η ∗ (sn −1 ) = sn −1 , η ∗ (en ) = ken .

The E 2 term of the homology Serre spectral sequence is 2 Es,t = Hs (B; Ht (F )) : H2n−1 (F) 0 0 Hn+1 (F ) 0 Hn(F ) 0 Hn (B; Hn (F )) 0 0 0 0 0 R 0 Hn (B) Hn+1 (B) Hn+2 (B) The firs nonzero differentials are: dn −1 : Hn (B; Hn (F )) → H2n −1 (F ) and the transgressions τ = dn + j +1 : Hn + j +1 (B) → Hn + j (F ) with 0 ≤ j ≤ n − 2. 83in 978 0 521 76037 9 December 26, 2009 Homotopy groups with coefficients It follows that we have the Serre long exact homology sequence τ → H2n −1 (F ) → H2n −1 (E) → H2n −1 (B) − τ H2n −2 (F ) → H2n −2 (E) → H2n −2 (B) − → ...

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