English

On strict isometric and strict symmetric commuting $d$-tuples of Banach space operators

Functional Analysis 2023-05-04 v2

Abstract

Given commuting dd-tuples Si\mathbb{S}_i and Ti\mathbb{T}_i, 1i21\leq i\leq 2, Banach space operators such that the tensor products pair (S1S2,T1T2)(\mathbb{S}_1\otimes\mathbb{S}_2,\mathbb{T}_1\otimes\mathbb{T}_2) is strict mm-isometric (resp., S1\mathbb{S}_1, S2\mathbb{S}_2 are invertible and (S1S2,T1T2)(\mathbb{S}_1 \otimes \mathbb{S}_2, \mathbb{T}_1 \otimes\mathbb{T}_2) is strict mm-symmetric), there exist integers mi>0m_i >0, and a non-zero scalar cc, such that m=m1+m21m=m_1+m_2-1, (S1,1cT1)(\mathbb{S}_1, {\frac{1}{c}}\mathbb{T}_1) is strict m1m_1-isometric and (S2,cT2)(\mathbb{S}_2, c\mathbb{T}_2) is strict m2m_2-isometric (resp., there exist integers mi>0m_i >0, and a non-zero scalar cc, such that m=m1+m21m=m_1+m_2-1, (S1,1cT1)(\mathbb{S}_1,{\frac{1}{c}}\mathbb{T}_1) is strict m1m_1-symmetric and (S2,cT2)(\mathbb{S}_2, c\mathbb{T}_2) is strict m2m_2-symmetric. However, (Si,Ti)(\mathbb{S}_i,\mathbb{T}_i) is strict mim_i-isometric (resp., strict mim_i-symmetric) for 1i21\leq i\leq 2 implies only that (S1S2,T1T2)(\mathbb{S}_1\otimes \mathbb{S}_2, \mathbb{T}_1\otimes \mathbb{T}_2) is mm-isometric (resp., (S1S2,T1T2)(\mathbb{S}_1 \otimes \mathbb{S}_2, \mathbb{T}_1\otimes\mathbb{T}_2) is mm-symmetric).

Keywords

Cite

@article{arxiv.2305.00898,
  title  = {On strict isometric and strict symmetric commuting $d$-tuples of Banach space operators},
  author = {B. P. Duggal},
  journal= {arXiv preprint arXiv:2305.00898},
  year   = {2023}
}

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