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arXiv 1702.07893cs.CGmath.AT
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持续同伦型距离

The Persistent Homotopy Type Distance

Patrizio Frosini, Claudia Landi, Facundo Memoli

摘要:

我们引入持久同伦型距离dHT来比较定义在可能不同的同伦等价拓扑空间上的实值函数。dHT定义的基本思想是测量应用于两个函数之一所需的最小移位,以便两个函数的子级集变得同伦等价。这个距离在与持久同源性有关的方面是有趣的。事实上,我们的主要结果表明,dHT仍然提供了一个上限的瓶颈之间的持久性图的干预功能的距离。此外,由于同伦等价比同胚弱,这意味着由L-infty距离和自然伪距离dNP提供的标准稳定性结果的提升。从另一个角度证明了dHT在两个方面推广了L-infty距离和dNP。首先,我们表明,适当地限制dHT适用的对象的类别,它可以与其他两个距离相一致。最后,我们表明,dHT有一个解释的交织,自然地把它放在家庭的持久性理论中使用的距离。

英文摘要:

We introduce the persistent homotopy type distance dHT to compare real valued functions defined on possibly different homotopy equivalent topological spaces. The underlying idea in the definition of dHT is to measure the minimal shift that is necessary to apply to one of the two functions in order that the sublevel sets of the two functions become homotopically equivalent. This distance is interesting in connection with persistent homology. Indeed, our main result states that dHT still provides an upper bound for the bottleneck distance between the persistence diagrams of the intervening functions. Moreover, because homotopy equivalences are weaker than homeomorphisms, this implies a lifting of the standard stability results provided by the L-infty distance and the natural pseudo-distance dNP. From a different standpoint, we prove that dHT extends the L-infty distance and dNP in two ways. First, we show that, appropriately restricting the category of objects to which dHT applies, it can be made to coincide with the other two distances. Finally, we show that dHT has an interpretation in terms of interleavings that naturally places it in the family of distances used in persistence theory.

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