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
Stefan Milošević
中科院分区:
数学3区
文献类型:
--
作者:
Danko R. Jocić;Milan Lazarević;Stefan Milošević

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设Φ是一个对称规范(sn)函数,p小于2,Φ (p)是一个对p修改的sn函数Φ (p)的双重sn函数,图像1,其中a和B是正常算子,使得图像2。如果A和B都是严格加积的,则对于非常数Pick函数φ∈P[0,+∞](1)|| φ (A) X−X φ (B)|| Φ≤|| φ ' (A + A) (A X−X B) φ ' (B+ B 2)|| Φ。如果A和B有严格压缩实部,则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。如果A是cohyponormal, B是hyponormal,至少其中一个是正常的,图片3,(2)π2 | |因为⁡⁎+π(tan⁡2π−X tan⁡2 Bπ)因为⁡B + B⁎π| |Φ(p)⁎⩽| | X−B | |Φ⁎(p)。不等式(1)推广了Heinz范数不等式[13,Hilfssatz 3]和均值范数不等式[21,th]的“差分”版本。4.4]求算子单调函数。如果A和B都(额外)正态,则不等式(2)对所有sn函数Φ仍然有效,这扩展了[32,th]中的不等式。[5]和[34,rem. 25]对于非必然自伴随算子A和B,它们的谱σ (H)和σ (K)包含在(−π/2, π/2)内的自伴随算子H和K。
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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