Generic and Typical Ranks of Three-Way Arrays

Details Generic and Typical Ranks of Three-Way Arrays Generic and Typical Ranks of Three-Way Arrays

2008-02-17

arxiv.org/abs/0802.2371v1

Computer Science

Other Computer Science

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The concept of tensor rank, introduced in the twenties, has been popularized at the beginning of the seventies. This has allowed to carry out Factor Analysis on arrays with more than two indices. The generic rank may be seen as an upper bound to the number of factors that can be extracted from a given tensor. We explain in this short paper how to obtain numerically the generic rank of tensors of arbitrary dimensions, and compare it with the rare algebraic results already known at order three. In particular, we examine the cases of symmetric tensors, tensors with symmetric matrix slices, or tensors with free entries.

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