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Talk:Arithmetical hierarchy

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This is an old revision of this page, as edited by Rotem Dan (talk | contribs) at 06:55, 12 June 2003 (Please use the talk page for discussion, thanks). The present address (URL) is a permanent link to this revision, which may differ significantly from the current revision.
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We need the following interesting facts:

  • The hierarchy does not collapse; which I think is from Kleene
  • possibly conflating this article with any analytical hierarchy article
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