一些超空间的非双Lipschitz 齐次性

A metric space(X, d) is called bi-Lipschitz homogeneous if for any points x, y ∈ X,there exists a self-homeomorphism h of X such that both h and h-1are Lipschitz and h(x) = y.Let 2(X,d)denote the family of all non-empty compact subsets of metric space(X, d) with the Hausdorff metric. In 1985, Hohti proved that 2([0,1],d)is not bi-Lipschitz homogeneous, where d is the standard metric on [0, 1]. We extend this result in two aspects. One is that 2([0,1],e)is not bi-Lipschitz homogeneous for an admissible metric e satisfying some conditions. Another is that 2(X,d)is not bi-Lipschitz homogeneous if(X, d) has a nonempty open subspace which is isometric to an open subspace of m-dimensional Euclidean space Rm.

On Non-Bi-Lipschitz Homogeneity of Some Hyperspaces

A metric space $(X, d)$ is called bi-Lipschitz homogeneous if for any points $x,yin X$, there exists a self-homeomorphism $h$ of $X$ such that both $h$ and $h^{-1}$ are Lipschitz and $h(x)=y$. Let $2^{(X,d)}$ denote the family of all non-empty compact subsets of metric space $(X,d)$ with the Hausdorff metric. In 1985, Hohti proved that $2^{([0,1],d)}$ is not bi-Lipschitz homogeneous, where $d$ is the standard metric on $[0,1]$. We extend this result in two aspects. One is that $2^{([0,1],varrho)}$ is not bi-Lipschitz homogeneous for an admissible metric $varrho$ satisfying some conditions. Another is that $2^{(X,d)}$ is not bi-Lipschitz homogeneous if $(X,d)$ has a nonempty open subspace which is isometric to an open subspace of $m$-dimensional Euclidean space $mathbb{R}^m$.