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步2卡诺群中H-有界变差函数的延拓与迹定理

An extension and trace theorem for functions of H-bounded variation in Carnot groups of step 2

Christina Selby

摘要:

当$Ω$是"H-容许的“且G是2阶卡诺群时,本文给出了函数$u \in BV_H(Ω)$到函数$u_0 \in BV_H(G)$的一个推广.证明了H-容许域包括非特征域和关于特征点具有部分对称性的海森堡型群中的域。给出了一个域为$C^{1,α}$、$α<1$的例子,该域不是H-容许的。当$Ω$是H-容许的时,证明了$u \in BV_H(Ω)$的迹定理.

英文摘要:

This paper provides an extension for a function $u \in BV_H(Ω)$ to a function $u_0 \in BV_H(G)$ when $Ω$ is ``H-admissible,'' and G is a step 2 Carnot group. It is shown that H-admissible domains include non-characteristic domains and domains in groups of Heisenberg type which have a partial symmetry about characteristic points. An example is given of a domain that is $C^{1,α}$, $α<1$, that is not H-admissible. Further, when $Ω$ is H-admissible a trace theorem is proved for $u \in BV_H(Ω)$.

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