By A. A. Ranicki

This ebook offers the definitive account of the functions of this algebra to the surgical procedure category of topological manifolds. The valuable result's the identity of a manifold constitution within the homotopy form of a Poincaré duality area with a neighborhood quadratic constitution within the chain homotopy form of the common hide. the variation 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 international quadratic duality buildings 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 unavoidably components via this one.

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Topology and Limits As we all know, the definition of limit used in real analysis reads as follows: The sequence of numbers (av)veN converges to the limit p if and only if, given an arbitrary e > 0, we can find an integer n such that v ^ n implies \av — p | < e. The set U((p) = {x : \ x — p | < c} is called an e-neighborhood of p. The convergence of the sequence {av}V£N to the limit p is equivalent to the following: Given any € > 0 there exists a terminating section An of the given sequence such that An ç: U€(p).

50 / / . Topo/ogica/ Spaces to what follows). Let N be the set of all x G M such that p ^ x < q and such that if p ^ y ^ x, then y e M. Since p e N} N Φ &. And since q is an upper bound of TV, TV possesses a sup s. Every neighborhood belonging to rs contains a point of N and also a point of UM. Hence s e N c M and 5 G UM. If M were both open and closed, we would have s e Mn \JM = M n u M , a contradiction. (2)—>-(l): Suppose a < b. If there exists no p e R such that a

10 Proof: (1)—>(2): Let M be a set different from 0 and from R. (if<7 < /), the proof would be analogous Condition (1) will serve later to characterize the notion of connectedness (Section 14). 50 / / . Topo/ogica/ Spaces to what follows). Let N be the set of all x G M such that p ^ x < q and such that if p ^ y ^ x, then y e M. Since p e N} N Φ &. And since q is an upper bound of TV, TV possesses a sup s. Every neighborhood belonging to rs contains a point of N and also a point of UM. Hence s e N c M and 5 G UM.