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Text File  |  1993-01-24  |  898 b   |  26 lines
  1. Newsgroups: sci.math.research
  2. Path: sparky!uunet!paladin.american.edu!howland.reston.ans.net!usc!sdd.hp.com!ux1.cso.uiuc.edu!news.cso.uiuc.edu!dan
  3. From: Allan Adler <ara@zurich.ai.mit.edu>
  4. Subject: Cremona transformations
  5. Message-ID: <ARA.93Jan24151029@camelot.ai.mit.edu>
  6. Originator: dan@symcom.math.uiuc.edu
  7. Sender: Daniel Grayson <dan@math.uiuc.edu>
  8. X-Submissions-To: sci-math-research@uiuc.edu
  9. Organization: M.I.T. Artificial Intelligence Lab.
  10. X-Administrivia-To: sci-math-research-request@uiuc.edu
  11. Approved: Daniel Grayson <dan@math.uiuc.edu>
  12. Date: Sun, 24 Jan 1993 20:10:29 GMT
  13. Lines: 11
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  17. Let X be a variety and f:X-->X a birational automorphism. Can one find
  18. a complete model Y of the function field of X such that f becomes
  19. an actual automorphism of Y (i.e. defined everywhere and its inverse
  20. is defined everywhere)? Can one take Y to be projective?
  21.  
  22. Allan Adler
  23. ara@altdorf.ai.mit.edu
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