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arXiv math/0202119math.AT
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Lusternik-Schnirelmann范畴中的A_{\infty} -方法

A_{\infty}-method in Lusternik-Schnirelmann category

Norio Iwase

摘要:

为了阐明作者在“Ganea关于Lusternik-Schnirelman范畴的猜想”这篇论文背后的方法,将Berstein-Hilton Hopf不变量的一个推广定义为“高阶Hopf不变量”。他们检测到更高的同伦结合性的Hopf空间,并研究了障碍,不增加LS类附加一个锥。在维数与LS范畴之间的一个条件下,利用广义高阶Hopf不变量得到了Ganea猜想在LS范畴上成立的一个判据,从而得到了Ganea猜想在LS范畴上成立的主要结果。“对于所有情况,除了当$p=2$。作为应用,给出了用特征映射的同伦不变量来判定球上球丛的LS范畴的条件。因此,我们发现一个闭流形$M$不满足Ganea关于LS范畴的猜想,而另一个闭流形$N$与它的“穿孔子流形”$N-\{P\}$,$P \in N$具有相同的LS范畴.但这里获得的所有例子都支持“Ganea's. ".

英文摘要:

To clarify the method behind the paper "Ganea's conjecture on Lusternik-Schnirelman category" by the author, a generalisation of Berstein-Hilton Hopf invariants is defined as `higher Hopf invariants'. They detect the higher homotopy associativity of Hopf spaces and are studied as obstructions not to increase the LS category by one by attaching a cone. Under a condition between dimension and LS category, a criterion for Ganea's conjecture on LS category is obtained using the generalised higher Hopf invariants, which yields the main result of "Ganea's ..." for all the cases except the case when $p=2$. As an application, conditions in terms of homotopy invariants of the characteristic maps are given to determine the LS category of sphere-bundles-over-spheres. Consequently, a closed manifold $M$ is found not to satisfy Ganea's conjecture on LS category and another closed manifold $N$ is found to have the same LS category as its `punctured submanifold' $N-\{P\}$, $P \in N$. But all examples obtained here support the conjecture in "Ganea's ...".

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