Global Surgery Formula for the Casson-Walker Invariant. (AM-140)
This book presents a new result in 3-dimensional topology. It is well known that any closed oriented 3-manifold can be obtained by surgery on a framed link inS3. InGlobal Surgery Formula for the Casson-Walker Invariant,a function F of framed links inS3is described, and it is proven that F consistently defines an invariant, lamda (l), of closed oriented 3-manifolds.lis then expressed in terms of previously known invariants of 3-manifolds. For integral homology spheres,lis the invariant introduced by Casson in 1985, which allowed him to solve old and famous questions in 3-dimensional topology.lbecomes simpler as the first Betti number increases.
As an explicit function of Alexander polynomials and surgery coefficients of framed links, the function F extends in a natural way to framed links in rational homology spheres. It is proven that F describes the variation oflunder any surgery starting from a rational homology sphere. Thus F yields a global surgery formula for the Casson invariant.
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