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Homotopy invariance of 4-manifold decompositions: Connected sums

机译:4流形分解的同伦不变性:连通和

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摘要

Given any homotopy equivalence f : M → X_1 # … #X_n of closed orientable 4-manifolds, where each fundamental group π_1(X_i) satisfies Freedman's Null Disc Lemma, we show that M is topologically h-cobordant to a connected sum M' = M'_1 #…#M'_n such that f is h-bordant to some f'_1(#… #f'_n with each f'_1 : M'_i →X_i a homotopy equivalence. Moreover, such a replacement M' of M is unique up to a connected sum of h-cobordisms. In summary, the existence and uniqueness, up to h-cobordism, of connected sum decompositions of such orientable 4-manifolds M is an invariant of homotopy equivalence. Also we establish that the Borel Conjecture is true in dimension 4, up to s-cobordism, if the fundamental group satisfies the Farrell-Jones Conjecture.
机译:给定任何同伦等值f:M→X_1#…#X_n为闭合可定向的四流形,其中每个基团π_1(X_i)满足Freedman的Null Disc Lemma,我们证明M在拓扑上与所求和的总和M'= co-corbordant。 M'_1#...#M'_n使得f与某些f'_1的h-bordant(#...#f'_n每个f'_1:M'_i→X_i是同伦等价的。此外,这样的替换M' M的大小在h-cobordisms的连接和之前是唯一的。总之,直到h-cobordism,此类可定向的4流形的连接和分解的存在和唯一性是同伦等价的不变式。如果基本群满足Farrell-Jones猜想,则Borel猜想在第4维上是正确的,直到s-cobordism。

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