[ Department of Mathematics]
[Shinshu University]
Matsumoto, 390-8621
Editor of this web site;
Keiichi Sakai
---ksakai(at)math.shinshu-u.ac.jp
Shinshu Topology Seminar

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Schedule

Monday 15 Jun 2020. 16:30--17:30 ** Online seminar, joint with Kyoto University and Kyushu University. The date has been changed.
Title : Generating functions and topological complexity
Speaker : Daisuke Kishimoto (Kyoto University)
Room : This seminar will be held online. Apply to the form for Zoom URL.
Abstract : The $r$-th topological complexity of a space $X$, $\mathrm{TC}_r(X)$, is defined to be the least integer $n$ such that $X^r$ is covered by $n$ open sets, each of which has a local homotopy section of the diagonal map $X\to X^r$. Farber and Opera asked for which finite CW-complex $X$ the generating function $$\mathcal{F}(X) = \sum_{r\ge 1}\mathrm{TC}_{r+1}(X)x^r$$ is of the form

$\frac{P(x)}{(1-t)^2}$

where $P(x)$ is a polynomial with $P(1)=\mathrm{cat}(X)$. I will talk about some results on this question.
This talk is based on joint work with Michael Farber, Don Stanley, and Atsushi Yamaguchi.

Apr. 2020 -- Mar. 2021


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