By A. A. Ranicki

This publication offers the definitive account of the functions of this algebra to the surgical procedure type of topological manifolds. The imperative result's the identity of a manifold constitution within the homotopy form of a Poincaré duality house with an area quadratic constitution within the chain homotopy kind of the common hide. the adaptation among the homotopy kinds of manifolds and Poincaré duality areas is pointed out with the fibre of the algebraic L-theory meeting map, which passes from neighborhood to worldwide quadratic duality buildings on chain complexes. The algebraic L-theory meeting map is used to provide a in basic terms algebraic formula of the Novikov conjectures at the homotopy invariance of the better signatures; the other formula unavoidably components via this one.

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**Extra resources for Algebraic L-theory and Topological Manifolds**

**Example text**

Given also a geometric Poincar´e cobordism (V ; X, X ′ ) there is deﬁned an (n + 1)dimensional geometric normal complex Y = V ∪∂ W . The normal signature of Y is the stable hyperquadratic signature σ ∗ (Y ) = (C(Y ), ϕ, γ, χ) ∈ N Ln+1 (Z[π1 (Y )]) = − lim Ln+4k+1 (Z[π1 (Y )]) , → k with boundary the quadratic signature of (f, b) relative to π1 (X)−−→π1 (Y ) ∂σ ∗ (Y ) = σ∗ (f, b) ∈ Ln (Z[π1 (Y )]) . (iv) For the mapping cylinder W of the 2-dimensional normal map (f, b) : X ′ = S 1 × S 1 −−→ X = S 2 determined by the exotic framing of S 1 × S 1 with Kervaire–Arf invariant 1 and for the geometric Poincar´e cobordism (V ; X, X ′ ) = (D3 ⊔ S 1 × D2 ; S 2 , S 1 × S 1 ) the construction of (iii) gives a simply-connected 3-dimensional geometric normal complex Y = V ∪∂ W such that ∂σ ∗ (Y ) = σ∗ (f, b) = 1 ∈ L2 (Z) = Z2 .

Free R-modules, with Whitehead torsion considerations. Given a ﬁnite chain complex C in A write C r = T (C)−r , Σn T (C) = C n−∗ . For a chain map f : C−−→C ′ the components in each degree of the dual chain map T (f ): T (C ′ )−−→T (C) are written f ∗ = T (f ) : C ′r = T (C ′ )−r −−→ C r = T (C)−r . Given also a ﬁnite chain complex D in A deﬁne the abelian group chain complex C ⊗A D = HomA (T (C), D) . The duality isomorphism ≃ TC,D : C ⊗A D −−→ D ⊗A C is deﬁned by TC,D = Σ(−)pq TCp ,Dq : (C ⊗A D)n = ∑ (Cp ⊗A Dq )r −−→ (D ⊗A C)n , p+q+r=n with inverse ≃ (TC,D )−1 = TD,C : D ⊗A C −−→ C ⊗A D .

The construction is covariant in both variables, with morphisms g: M −−→ M ′ , h: N −−→N ′ in A inducing abelian group morphisms g ⊗A h : M ⊗A N −−→ M ′ ⊗A N ′ ; (f : T (M )−−→N ) −−→ (hf T (g): T (M ′ )−−→N ′ ) . The duality isomorphism of abelian group chain complexes ≃ TM,N : M ⊗A N −−→ N ⊗A M 28 Algebraic L-theory and topological manifolds is deﬁned by TM,N : (M ⊗A N )n = HomA (T (M )−n , N ) ≃ −−→ (N ⊗A M )n = HomA (T (N )−n , M ) ; (f : T (M )−n −−→N ) −−→ (TM,N (f ): T (N )−n −−→M ) with TM,N (f ) = e(M )T (f ) : T (N )−n −−→ T (T (M )−n )−n ⊆ T 2 (M )0 −−→ M0 = M .