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The diffeomorphism groups of the real line are pairwise bihomeomorphic

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 Added by Taras Banakh
 Publication date 2009
  fields
and research's language is English




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We prove that the group D^r(R) of C^r diffeomorphisms of the real line, endowed with the compact-open and Whitney C^r topologies, is bihomeomorphic to the group H(R) of homeomorphisms of the real line endowed with the compact-open and Whitney topologies. This implies that the diffeomorphism group D^r(R) endowed with the Whitney C^r topology is homeomorphic to the countable box-power of the separable Hilbert space.



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