The Whitney extension problem for Zygmund spaces and Lipschitz selections in hyperbolic jet-spaces

Details The Whitney extension problem for Zygmund spaces and Lipschitz selections in hyperbolic jet-spaces The Whitney extension problem for Zygmund spaces and Lipschitz selections in hyperbolic jet-spaces

2009-05-15

arxiv.org/abs/0905.2602v1

Mathematics

Functional Analysis

43 pages

Scientific paper

We study a variant of the Whitney extension problem for the space $C^k\Lambda^m_{\omega}(R^n)$ of functions whose partial derivatives of order $k$ satisfy the generalized Zygmund condition. We identify $C^k\Lambda^m_{\omega}(R^n)$ with a space of Lipschitz mappings from a metric space $(R^{n+1}_+,\rho_\omega)$ supplied with a hyperbolic metric $\rho_\omega$ into a metric space $({\cal P}_{k+m-1}\times R^{n+1}_+, d_\omega)$ of polynomial fields on $R^{n+1}_+$ equipped with a hyperbolic-type metric $d_\omega$. This identification allows us to reformulate the Whitney problem for $C^k\Lambda^m_{\omega}(R^n)$ as a Lipschitz selection problem for set-valued mappings from $(R^{n+1}_+,\rho_\omega)$ into a certain family of subsets of ${\cal P}_{k+m-1}\times R^{n+1}_+$.

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