[FOM] Exact Upper Bound

pax0 at seznam.cz pax0 at seznam.cz
Mon Dec 26 16:20:55 EST 2011


  The notion of an Exact Upper Bound is well-known, see page 1155 at
  http://dutiaw37.twi.tudelft.nl/~kp/onderwijs/set_theory/material/14-abraham_magidor-cardinal_arithmetic.pdf
  
  Question:
  What is an example of, P,  X and a, such that "a=supX" but which is not an Exact Upper Bound.
  
  Thank you, Jan Pax 
  
  


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