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arXiv 1202.5286math.AT
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拓扑复杂性是一个Fibrewise L-S范畴

Topological Complexity is a Fibrewise L-S Category

Norio Iwase, Michihiro Sakai

摘要:

空间$B$的拓扑复杂度$\TC{B}$是由M. Farber的方法来度量空间的复杂程度,首先考虑机器人手臂运动规划的配置空间,我们还考虑了一个附加条件的拓扑复杂性的更强版本$\TCM{B}$:在机器人运动规划中,如果初始状态和终端状态相同,则运动必须是静止的。我们的主要目标是显示等式$\TC{B} = \catBb{\double{B}}+1$和$\TCM{B} = \catBB{\double{B}}+1$,其中$\double{B}=B{\times}B$是$B$上的纤维指向空间,其投影和截面由$p_{\double{B}}=\proj_{2} : B{\times}B \to B$给出,$p_{\double{B}}=\proj_{2} : B{\times}B \to B$是第二个因子的正则投影,$s_{\double{B}}=Δ_{B} : B \to B{\times}B the diagonal. In addition, our method in studying fibrewise L-S category is able to treat a fibrewise space with singular fibres. Recently, we found a problem with the proof of Theorem 1.13 which states that for a fibrewise well-pointed space $ X $ over $ B $, we have $ \catBB{X} $ = \catBb{X}$,对于局部有限单纯复$B$,我们有$\TC{B} = \TCM{B}$。虽然我们仍然猜想定理1.13是正确的,但这个问题意味着,目前还没有给出定理1.13存在的证明。另外,我们证明了两个不变量$\catBb{X}$和$\catBB{X}$之间的差至多为1,并且该猜想在某些情况下成立。我们主要在定理1.12的证明中作了进一步的修正。

英文摘要:

Topological complexity $\TC{B}$ of a space $B$ is introduced by M. Farber to measure how much complex the space is, which is first considered on a configuration space of a motion planning of a robot arm. We also consider a stronger version $\TCM{B}$ of topological complexity with an additional condition: in a robot motion planning, a motion must be stasis if the initial and the terminal states are the same. Our main goal is to show the equalities $\TC{B} = \catBb{\double{B}}+1$ and $\TCM{B} = \catBB{\double{B}}+1$, where $\double{B}=B{\times}B$ is a fibrewise pointed space over $B$ whose projection and section are given by $p_{\double{B}}=\proj_{2} : B{\times}B \to B$ the canonical projection to the second factor and $s_{\double{B}}=Δ_{B} : B \to B{\times}B the diagonal. In addition, our method in studying fibrewise L-S category is able to treat a fibrewise space with singular fibres. Recently, we found a problem with the proof of Theorem 1.13 which states that for a fibrewise well-pointed space $X$ over $B$, we have $\catBB{X}$ = \catBb{X}$ and that for a locally finite simplicial complex $B$, we have $\TC{B} = \TCM{B}$. While we still conjecture that Theorem 1.13 is true, this problem means that, at present, no proof is given to exist. Alternatively, we show the difference between two invariants $\catBb{X}$ and $\catBB{X}$ is at most 1 and the conjecture is true for some cases. We give further corrections mainly in the proof of Theorem 1.12.

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