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arXiv 1909.01737math.COmath-phmath.MPquant-ph
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具有不变性的单纯复形上的张量分解

Tensor decompositions on simplicial complexes with invariance

Gemma De las Cuevas, Matt Hoogsteder Riera, Tim Netzer

AI总结:

提出单纯复形上群作用不变的张量分解框架,证明存在性与秩不等式,并推广至非负及半正定张量分解。

摘要:

我们开发了一个用于分析张量积空间中元素的不变分解的框架。具体而言,我们定义了一种不变分解,其指标排列在一个单纯复形上,并且在群作用下显式不变。我们证明,在可能对单纯复形进行扩充之后,这种分解对所有不变张量都存在。作为特例,我们恢复了具有平移不变性的张量网络以及对称张量分解。我们还定义了不变可分分解和纯化形式,并证明了类似的存在性结果。每种分解都对应一个秩,我们证明了这些秩之间的若干不等式。例如,我们展示了在分解中施加不变性时秩会增加多少,并证明张量秩是所有秩中最大的。最后,我们将该框架应用于非负张量,在具有群作用的任意单纯复形上定义了非负分解和半正定分解。我们展示了其与前述秩的对应关系,并作为非常特殊的情形恢复了非负、半正定、完全正以及完全正半正定转置分解。

英文摘要:

We develop a framework to analyse invariant decompositions of elements of tensor product spaces. Namely, we define an invariant decomposition with indices arranged on a simplicial complex, and which is explicitly invariant under a group action. We prove that this decomposition exists for all invariant tensors after possibly enriching the simplicial complex. As a special case we recover tensor networks with translational invariance and the symmetric tensor decomposition. We also define an invariant separable decomposition and purification form, and prove similar existence results. Associated to every decomposition there is a rank, and we prove several inequalities between them. For example, we show by how much the rank increases when imposing invariance in the decomposition, and that the tensor rank is the largest of all ranks. Finally, we apply our framework to nonnegative tensors, where we define a nonnegative and a positive semidefinite decomposition on arbitrary simplicial complexes with group action. We show a correspondence to the previous ranks, and as a very special case recover the nonnegative, the positive semidefinite, the completely positive and the completely positive semidefinite transposed decomposition.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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