By A. A. Ranicki

This e-book offers the definitive account of the purposes of this algebra to the surgical procedure class of topological manifolds. The crucial result's the identity of a manifold constitution within the homotopy form of a Poincaré duality area with an area quadratic constitution within the chain homotopy kind of the common conceal. the variation among the homotopy sorts 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 constructions on chain complexes. The algebraic L-theory meeting map is used to provide a only algebraic formula of the Novikov conjectures at the homotopy invariance of the better signatures; the other formula inevitably elements via this one.

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**Example text**

In the sort of analytic problems we will be interested in, there is a map 1 that takes a normed linear space X into itself, and the solution to the analytic problem is a fixed point of I. However, the Schauder theorem turns out to be awkward to use in this situation because to apply it you need to find a closed, bounded convex set that is mapped by 1 back into itself, and such a set seldom leaps up and announces itself. The hypothesis that is used to produce a more convenient form of the Schauder theorem is called the Leray-Schauder boundary condition.

1 = d(flV, V) = d(fIUm , Um). On the other hand, we will see that we can apply the homotopy property to show that d(g, V x W) = d(f, V x W) and therefore complete the proof. The homotopy H: V X W X [0,1]- Rn is defined by H(x, t) = tf(x) + (1 - t)g(x) so it is just determined by the line segment in Rn between f(x) and g(x). Thinking of V X W as a subset of Rm x Rn-m = Rn, we write its points as pairs x = (v, w). The hypothesis 7rn - m f = 7rn - m means that f(v, w) = (v',w) for some v' E Rm whereas, by definition, g(v,w) = «(fIV)(v),w) = (v" , w).

What we wish to prove in the next chapter is that there is a function y = y( s) that satisfies the boundary condition and, for every s E [0, 1], it and its derivatives satisfy the relationship y"(s) = I(s, y(s), y'(s)). :s :s :s CHAPTER 6 Generalized Bernstein Theory The title of this chapter refers to the fact that, by the use of topological methods, Granas, Guenther and Lee [GGL] were able to extend the classical boundary value theory of Bernstein [B] to nonlinear problems. This chapter is based on their work.