Some new estimates of the ‘Jensen gap’

Some new estimates of the ‘Jensen gap’
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对“詹森差距”的一些新估计

DOI:
10.1186/s13660-016-0985-4
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发表时间:
2016
影响因子:
1.6
通讯作者:
L. Persson
L. Persson
中科院分区:
数学3区
文献类型:
--
作者:
S. Abramovich;L. Persson

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设(μ,Ω)$(\mu,\Omega)$是一个概率测度空间。我们考虑所谓的“詹森间隙”J(φ,μ,f)=<$Ωφ(f(s))dμ(s)−φ(<$Ωf(s)dμ(s))$$ J(\varphi,\mu,f)= \int_{\Omega}\varphi \bigl(f(s)\bigr)\,d\mu(s)-\varphi \biggl(\int_{\Omega }f(s)\,d\mu(s)\biggr)$$对于某些函数类φ。几个新的估计和等式的推导和比较与其他结果的这种类型。特别是当φ具有Taylor展开式时,给出了相应的离散结果。
Let (μ,Ω)$( \mu,\Omega ) $ be a probability measure space. We consider the so-called ‘Jensen gap’ J(φ,μ,f)=∫Ωφ(f(s))dμ(s)−φ(∫Ωf(s)dμ(s))$$ J ( \varphi,\mu,f ) = \int_{\Omega}\varphi \bigl( f ( s ) \bigr)\,d\mu ( s ) -\varphi \biggl( \int_{\Omega }f ( s )\,d\mu ( s ) \biggr) $$ for some classes of functions φ. Several new estimates and equalities are derived and compared with other results of this type. Especially the case when φ has a Taylor expansion is treated and the corresponding discrete results are pointed out.