Sobolev Mappings, Degree, Homotopy Classes and Rational Homology Spheres

Sobolev Mappings, Degree, Homotopy Classes and Rational Homology Spheres
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索博列夫映射、度数、同伦类和有理同调域

DOI:
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发表时间:
2011
期刊:
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通讯作者:
P. Hajłasz
P. Hajłasz
中科院分区:
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文献类型:
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作者:
P. Goldstein;P. Hajłasz

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本文研究了流形间Orlicz-Sobolev映射W1,P(M,N)的阶和同伦理论,其中Young函数P满足一个发散条件,并形成一个比W1,n,n= dimM稍大的空间.特别地,我们证明了:如果M和N是无边界的紧定向流形,且dim M=dim N=n,则其度在W1,P(M,N)中定义良好当且仅当N的泛覆盖不是有理同调球面,且在n=4的情况下,当且仅当N不同胚于S4.
In this paper we investigate the degree and the homotopy theory of Orlicz–Sobolev mappings W1,P(M,N) between manifolds, where the Young function P satisfies a divergence condition and forms a slightly larger space than W1,n, n=dim M. In particular, we prove that if M and N are compact oriented manifolds without boundary and dim M=dim N=n, then the degree is well defined in W1,P(M,N) if and only if the universal cover of N is not a rational homology sphere, and in the case n=4, if and only if N is not homeomorphic to S4.