Inequalities for generalized derivations of operator monotone functions in norm ideals of compact operators
Inequalities for generalized derivations of operator monotone functions in norm ideals of compact operators
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紧算子范数理想中算子单调函数的广义导数不等式
DOI:
10.1016/j.laa.2019.10.009
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发表时间:
2020
影响因子:
1.1
通讯作者:
Stefan Milošević
中科院分区:
文献类型:
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作者:
Danko R. Jocić;Milan Lazarević;Stefan Milošević
Let Φ be a symmetrically norming (sn) function, p⩾ 2, Φ (p)⁎ to be a dual sn function to p-modified sn function Φ (p), Image 1, with A and B being normal operators such that Image 2. If both A and B are strictly accretive, then for non-constant Pick function φ∈ P [0,+∞)(1)|| φ (A) X− X φ (B)|| Φ⩽|| φ′(A⁎+ A 2)(A X− X B) φ′(B+ B⁎ 2)|| Φ. If A and B have strictly contractive real parts, then 1 2|| I−| A⁎+ A 2| 2 (log I+ A I− A X− X log I+ B I− B)× I−| B+ B⁎ 2| 2|| Φ⩽|| A X− X B|| Φ. If A is cohyponormal, B is hyponormal and at least one of them is normal, such that Image 3, then (2) π 2|| cos A⁎+ A π (tan 2 A π X− X tan 2 B π) cos B+ B⁎ π|| Φ (p)⁎⩽|| A X− X B|| Φ (p)⁎. Inequality (1) generalizes “difference” version of Heinz norm inequality [13, Hilfssatz 3] and mean values norm inequality [21, th. 4.4] for operator monotone functions. Inequality (2) remains valid for all sn function Φ if A and B are both (additionally) normal, which extends inequalities in [32, th. 5] and [34, rem. 25] for self-adjoint operators H and K, whence their spectra σ (H) and σ (K) are contained in (− π/2, π/2), to non necessarily self-adjoint operators A and B.
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发表时间:
2008
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作者:
J. C. Bourin;M. Uchiyama;Mitsuru Uchiyama;内山 充;幸崎 秀樹;幸崎 秀樹;Mitsuru Uchiyama;Mitsuru Uchiyama;内山 充;内山 充;内山 充;Mitsuru Uchiyama;内山 充;M. Uchiyama;M. Uchiyama;内山 充
通讯作者:
内山 充
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