Minimality of tensors of fixed multilinear rank

This page contains computations related to the paper:

Alexander Heaton, Khazhgali Kozhasov, and Lorenzo Venturello: Minimality of tensors of fixed multilinear rank

In: Linear and multilinear algebra, Vol. not yet known, pp. not yet known

DOI: 10.1080/03081087.2022.2062274 ARXIV: https://arxiv.org/abs/2007.08909 CODE: https://mathrepo.mis.mpg.de/tensorminimality

In this article, we discover a geometric property of the space of tensors of fixed multilinear (Tucker) rank. Namely, we show that real tensors of fixed multilinear rank form a minimal submanifold of the Euclidean space of all tensors of given format endowed with the Frobenius inner product.

Here, we present a computation which verifies a (very) special case of our main theorem. Namely, we compute the mean curvature vector field of a submanifold of Euclidean space, showing that it is everywhere vanishing. We also compute the mean curvature vector field of a related submanifold of interest in statistics, formed by slicing the minimal sub manifold with an affine hyperplane. Since this submanifold is no longer minimal, we visualize its mean curvature vector field, shown below.

The Jupiter file making these computations can be seen by clicking the link below.

• Minimality of tensors of fixed multilinear rank
• Now we will see a minimal submanifold

The Jupyter notebook can be downloaded here.

Project page created: 25/11/2020

Code contributors: Alexander Heaton

Jupyter Notebook written by: Alexander Heaton, 25/11/2020

The software we use for our computations is SageMath 9.1.

Corresponding author of this page: Alexander Heaton