Extendability of Classes of Maps and New Properties of Upper Sets
Extendability of Classes of Maps and New Properties of Upper Sets
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映射类的可扩展性和上集的新性质
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发表时间:
2011
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通讯作者:
D. A. Trotsenko
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作者:
D. A. Trotsenko
We continue to study upper sets $${widetilde{A}={(x,r)in A imes R_+ :exists yin Asetminus{x}, r=|x-y|}}$$ equipped by hyperbolic metric. We define analogous of quasiconvexity, simply connectedness and nearlipschitz functions. We give a new definition of quasisymmetry as nearlipschitz characteristic on $${widetilde{A}}$$. In the final part in terms of upper sets we give the following extension property of $${Asubset R^2}$$. For $${0levarepsilonle delta}$$, each $${(1+varepsilon)}$$-bilipschitz map f : A → R2 has an extension to a $${(1+Cvarepsilon)}$$-bilipschitz map F : R2 → R2.