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arXiv 0908.4501math.AT
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稳定情形下同伦不变量的阶

Order of a homotopy invariant in the stable case

S. S. Podkorytov

摘要:

设X和Y是CW-复形,U是阿贝尔群,f:[X,Y]->U是一个映射(一个同伦不变量).如果连续映射a:X->Y的图的r次笛卡尔幂的特征函数Z-线性地决定f([a]),则称f的阶至多为r。假设CW-复形X是有限的,并且我们在稳定的情况下:dim X<2n-1,Y是(n-1)-连通的。我们证明了f的阶等于它关于群[X,Y]的Curtis滤子的次数。

英文摘要:

Let X and Y be CW-complexes, U be an abelian group, and f:[X,Y]->U be a map (a homotopy invariant). We say that f has order at most r if the characteristic function of the r'th Cartesian power of the graph of a continuous map a:X->Y Z-linearly determines f([a]). Suppose that the CW-complex X is finite and we are in the stable case: dim X<2n-1 and Y is (n-1)-connected. We prove that then the order of f equals its degree with respect to the Curtis filtration of the group [X,Y].

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