Tverberg加约束
Tverberg plus constraints
摘要：
许多加强和扩展的拓扑特沃伯格定理可以得出令人惊讶的容易直接从原来的定理：为此，我们介绍了一种证明技术，结合了“特沃伯格不可避免的subcomplex”的概念与观察特沃伯格点，均衡的距离，从这样一个subcomplex可以从地图上获得一个扩展的目标空间。因此，我们得到了拓扑Tverberg定理的许多变体的简单证明，例如Zivaljevic和Vrecica（1992）的着色Tverberg定理。我们还得到了Sarkaria（1991）和Volovikov（1996）的广义van Kampen-Flores定理的一个新的加强版本，他们的“j-不相交”Tverberg定理的一个仿射版本，以及Soberon（2013）关于具有相等重心坐标的Tverberg点的结果的一个拓扑版本。
英文摘要：
Many of the strengthenings and extensions of the topological Tverberg theorem can be derived with surprising ease directly from the original theorem: For this we introduce a proof technique that combines a concept of "Tverberg unavoidable subcomplexes" with the observation that Tverberg points that equalize the distance from such a subcomplex can be obtained from maps to an extended target space. Thus we obtain simple proofs for many variants of the topological Tverberg theorem, such as the colored Tverberg theorem of Zivaljevic and Vrecica (1992). We also get a new strengthened version of the generalized van Kampen-Flores theorem by Sarkaria (1991) and Volovikov (1996), an affine version of their "j-wise disjoint" Tverberg theorem, and a topological version of Soberon's (2013) result on Tverberg points with equal barycentric coordinates.
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