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arXiv 2109.06336math.PRmath.APmath.FA
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关于方向卷积等价密度

On directional convolution equivalent densities

Kamil Kaleta, Daniel Ponikowski

摘要:

我们提出了一个方向多元次指数和卷积等价密度的定义,并找到了一类可积和几乎径向减函数这些概念的一个有用的特征。我们应用这个结果表明,建立在一个给定的密度$f$的复合泊松测度的绝对连续部分的密度是方向卷积等价的,并继承其渐近行为从$f$当且仅当$ f$是方向卷积等价的。我们还将这一特征扩展到更一般的无穷可分分布的密度$\mathbb{R}^d$,$d \geq 1$,这不是纯粹的复合泊松。

英文摘要:

We propose a definition of directional multivariate subexponential and convolution equivalent densities and find a useful characterization of these notions for a class of integrable and almost radial decreasing functions. We apply this result to show that the density of the absolutely continuous part of the compound Poisson measure built on a given density $f$ is directionally convolution equivalent and inherits its asymptotic behaviour from $f$ if and only if $ f$ is directionally convolution equivalent. We also extend this characterization to the densities of more general infinitely divisible distributions on $\mathbb{R}^d$, $d \geq 1$, which are not pure compound Poisson.

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