The irreducibility characterization of primitive nonnegative tensors
Let be a nonnegative tensor of order and dimension . A tensor is irreducible if there is no nonempty proper subset such that
A tensor is -primitive when its -primitive degree is finite, equivalently when some tensor power has the relevant positivity in column .
Irreducibility characterization conjecture. A nonnegative tensor is primitive if and only if is irreducible and there exists some such that is -primitive.
For matrices, the corresponding characterization follows from strong connectivity of the associated digraph and the period-one condition. The source proposes the tensor analogue; no resolution is given in the supplied text.
References
Primary source
Pingzhi Yuan, Zilong He and Lihua You, “New result and some open problems on the primitive degree of nonnegative tensors”, arXiv:1408.3457 (2014).
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