Bruno,
           Before I leave on holiday, I am following your advice to make my own 
table of symbols. Let me ask first whether the smaller rectangles have a 
different reference from the larger ones as seen in your example below?

  ----- Original Message ----- 
  From: Bruno Marchal 
  To: everything-list@googlegroups.com 
  Sent: Wednesday, June 03, 2009 1:15 PM
  Subject: Re: The seven step-Mathematical preliminaries 2


  ∅ ∪ A =
  ∅ ∪ B =
  A ∪ ∅ =
  B ∪ ∅ =
  N ∩ ∅ =
  B ∩ ∅ =
  ∅ ∩ B =
  ∅ ∩ ∅ =
  ∅ ∪ ∅ =




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