By Gunnar E. Carlsson, Ralph L. Cohen, Wu-Chung Hsiang, John D.S. Jones

ISBN-10: 0387940987

ISBN-13: 9780387940984

In 1989-90 the Mathematical Sciences learn Institute carried out a application on Algebraic Topology and its functions. the most components of focus have been homotopy idea, K-theory, and purposes to geometric topology, gauge idea, and moduli areas. Workshops have been carried out in those 3 parts. This quantity contains invited, expository articles at the themes studied in this software. They describe fresh advances and aspect to attainable new instructions. they need to end up to be important references for researchers in Algebraic Topology and comparable fields, in addition to to graduate scholars.

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Therefore the integer j∗ (α) can be any multiple of 2. August 26, 2009 16:21 9in x 6in 32 b789-ch02 M. Kervaire and J. Milnor Let us study the eﬀect of replacing ε by εα = ε+j(α)ε on the homology of the modiﬁed manifold. 6, where i carries ε into an element λ of order l > 1. Evidently lε must be a multiple of ε , say: lε + l ε = 0. Since ε is not a torsion element, these two elements can satisfy no other relation. Since εα = ε + j∗ (α)ε it follows that lεα + (l − lj(α))ε = 0. Now using the sequence ε i α α Hk M 0 → Hk Mα → 0, Z→ we see that the inclusion homomorphism iα carries ε into an element λα ∈ Hk Mα of order |l − lj(α)|.

Adams [1], [2]. Proof. Let Σ be a homotopy n-sphere. Then the only obstruction to the triviality of τ ⊕ ε1 is a well-deﬁned cohomology class on (Σ) ∈ H n (Σ; πn−1 (SOn+1 )) = πn−1 (SOn+1 ). The coeﬃcient group may be identiﬁed with the stable group πn−1 (SO). But these stable groups have been computed by Bott [4], as follows, for n ≥ 2: The mod 8 residue class: 0 πn−1 (SO) 1 2 3 4 5 6 7 Z Z2 Z2 0 Z 0 0 0. ) Case 1. n ≡ 3, 5, 6 or 7 (mod 8). Then πn−1 (SO) = 0, so that on (Σ) is trivially zero. Case 2.

Definition. The linking number L(λ, µ) is the rational number modulo 1 deﬁned by L(λ, µ) = ν · µ. This linking number is well deﬁned, and satisﬁes the symmetry relation L(µ, λ) + (−1)pq L(λ, µ) = 0 (compare Seifert and Threlfall [23]). 4. The ration l /l modulo 1 is, up to sign, equal to the selflinking number L(λ, λ). Proof. Since lε + l ε = 0 in Hk M0 , we see that the cycle lε + l ε on bM0 bounds a chain c on M0 . Let c1 = ϕ(x0 ×Dk+1 ) denote the cycle in ϕ(S k ×Dk+1 ) ⊂ M with boundary ε . Then the chain c − l c1 , has boundary lε; hence (c − l c1 )/l has boundary ε, representing the homology class λ in Hk M .

### Algebraic Topology and Its Applications by Gunnar E. Carlsson, Ralph L. Cohen, Wu-Chung Hsiang, John D.S. Jones

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