Abstract
Several basic properties of tensor nuclear norms are established in [S. Friedland and L.-H. Lim, Math. Comp., 87 (2018), pp. 1255–1281]. In this work, we give further studies on tensor nuclear norms. We present some special cases of tensor nuclear decompositions. We list some examples to show basic relationships among tensor rank, orthogonal rank and nuclear rank. Spectral and nuclear norms of Hermitian tensors are studied. We show that spectral and nuclear norms of real Hermitian decomposable tensors do not depend on the choice of base field. At last, we extend matrix polar decompositions to the tensor case, which is the product of a Hermitian tensor and a tensor whose spectral norm equals one. That is, we establish a link between any tensor and a Hermitian tensor. Bounds of nuclear rank are given based on tensor polar decompositions.
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Notes
Similarly, we can define the contraction between two tensors on any modes. In this paper, we only need the contraction on the first few modes. For convenience, we define \(\mathcal {A}(\mathcal {B})\) in this fashion.
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This work was partially supported by the National Natural Science Foundation of China (12201319) and the Fundamental Research Funds for the Central Universities, Nankai University (63231142).
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Chao Zeng is the single author of the manuscript and responsible for this work.
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Zeng, C. Further results on tensor nuclear norms. Calcolo 60, 34 (2023). https://doi.org/10.1007/s10092-023-00528-2
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DOI: https://doi.org/10.1007/s10092-023-00528-2
Keywords
- Tensor nuclear norm
- Tensor spectral norm
- Nuclear decomposition
- Hermitian tensor
- Tensor polar decomposition