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arXiv 1609.03043math.DG
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3D-Heisenberg群中的运动学公式

The kinematic formula in the 3D-Heisenberg group

Yen-Chang Huang

摘要:

通过研究3D-Heisenberg群$H_1$中的刚体运动群$PSH(1)$,定义了水平线的密度和测度.证明了凸域$D\subset H_1$的体积等于与$D$相交的所有水平线上弦长的积分。作为积分几何中的经典结果,我们还定义了$PSH(1)$的运动密度,并给出了当$v$包含在$D_0$中时,随机抛出一个与凸域$D\subset D_0$有关的向量$v$的概率.这两个结果都表明了用变分方法处理Cheng-Hwang-Malchiodi-Yang工作中的几何概率和自然几何量之间的关系。

英文摘要:

By studying the group of rigid motions, $PSH(1)$, in the 3D-Heisenberg group $H_1$, we define the density and the measure for the sets of horizontal lines. We show that the volume of a convex domain $D\subset H_1$ is equal to the integral of length of chord over all horizontal lines intersecting $D$. As the classical result in integral geometry, we also define the kinematic density for $PSH(1)$ and show the probability of randomly throwing a vector $v$ interesting the convex domain $D\subset D_0$ under the condition that $v$ is contained in $D_0$. Both results show the relationship connecting the geometric probability and the natural geometric quantity in Cheng-Hwang-Malchiodi-Yang's work approached by the variational method.

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