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arXiv 1502.00947math.COmath.ATmath.MG
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拓扑Tverberg猜想的反例

Counterexamples to the topological Tverberg conjecture

Florian Frick

摘要:

Bárány、Shlosman和Szlovcs(1981)的“拓扑Tverberg猜想”指出,维数为$(r-1)(d+1)$到$\mathbb{R}^d$的单形的任何连续映射都将单形的$r$不相交面的点映射到$\mathbb{R}^d$中的同一点。这是由Tverberg(1966)针对仿射映射建立的,对于$r$是素数的情况,由Bárány等人建立,以及Özaydin(1987)的素数幂$r$。我们将Mabillard和Wagner(2014)宣布的广义van Kampen定理与Blagojević,Ziegler和作者(2014)的约束方法相结合,从而证明了拓扑Tverberg猜想的反例的存在性,对于任何数量的非素数幂的面$r$。然而,这些反例要求上域的维数$d$足够高:我们得到的最小反例是$100$维单形到$\mathbb{R}^{19}$的映射,对于$r=6$。

英文摘要:

The "topological Tverberg conjecture" by Bárány, Shlosman and Szűcs (1981) states that any continuous map of a simplex of dimension $(r-1)(d+1)$ to $\mathbb{R}^d$ maps points from $r$ disjoint faces of the simplex to the same point in $\mathbb{R}^d$. This was established for affine maps by Tverberg (1966), for the case when $r$ is a prime by Bárány et al., and for prime power $r$ by Özaydin (1987). We combine the generalized van Kampen theorem announced by Mabillard and Wagner (2014) with the constraint method of Blagojević, Ziegler and the author (2014), and thus prove the existence of counterexamples to the topological Tverberg conjecture for any number $r$ of faces that is not a prime power. However, these counterexamples require that the dimension $d$ of the codomain is sufficiently high: the smallest counterexample we obtain is for a map of the $100$-dimensional simplex to $\mathbb{R}^{19}$, for $r=6$.

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