Algebraic Methods in Unstable Homotopy Theory - download pdf or read online

By Joseph Neisendorfer

The main sleek and thorough therapy of volatile homotopy thought on hand. the focal point is on these equipment 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 variety of elements of risky homotopy thought, together with: homotopy teams with coefficients; localization and crowning glory; 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 publication is appropriate for a path in risky homotopy concept, following a primary direction in homotopy conception. it's also a necessary reference for either specialists and graduate scholars wishing to go into the sector.

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3) If n ≥ 2 show that ϕ : πn (X; Z/kZ) → Hn (X; Z/kZ) is an isomorphism if ϕ ⊗ 1 : πn (X) ⊗ Z/kZ → Hn (X) ⊗ Z/kZ and TorZ (ϕ, 1) : TorZ (πn −1 (X), Z/kZ) → TorZ (Hn (X), Z/kZ) are isomorphisms. 8 The mod k Hurewicz isomorphism theorem Recall that a connected pointed space X is called nilpotent if the fundamental group π1 (X) acts nilpotently on all the homotopy groups πn (X) for n ≥ 1. In particular, the fundamental group must be nilpotent. In the next theorem, π1 (X) will be abelian and π1 (X; Z/kZ) is understood to be π1 (X) ⊗ Z/kZ.

Then use naturality. 4. If 0 → H → G → G/H → 0 is a short exact sequence of finitel generated abelian groups and n ≥ 2, then there is a cofib ation sequence P n (G/H) → P n (G) → P n (H). Proof: Let f : P n (G/H) → P n (G) be a map which induces the projection G → H in integral cohomology. The mapping cone Cf is then a P n (H). The maps in the above corollary are not always unique up to homotopy. But the space P n (H) is unique up to homotopy type in case n ≥ 3. In the next section we will restrict to a short exact sequence of cyclic groups η ρ − Z/k Z − → Z/kZ → 0 0 → Z/ Z → and produce a more specifi construction of this cofibratio sequence.

The map ρ is called a mod k reduction map and the map β is called a Bockstein. The above exact sequence is always an exact sequence of sets and an exact sequence of groups and homomorphisms except possibly at ρ β − π2 (X; Z/kZ) − → π1 (X) π2 (X) → when π2 (X; Z/kZ) is not a group. Of course, if X is a homotopy associative Hspace it is always an exact sequence of groups and homomorphisms. In the general case, we have a substitute which is adequate for many purposes: The natural pinch map P 2 (Z/kZ) → P 2 (Z/kZ) ∨ S 2 yields an action π2 (X) × π2 (X; Z/kZ) → π2 (X; Z/kZ), (h, f ) → h ∗ f .

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