(I'll be here till Tuesday.) Evidently, the symbol you are using for "such 
that" is being shown on my screen as a small rectangle. In the copy below, I 
see two rectangles before the A=, two before the B=, two after the A, two after 
the B. The  UNION symbol (inverted  "U") shows up but is followed by a 
rectangle in the next two examples and preceded by a rectangle in the last 
three. In checking a table of logic notaion, I find that the relation "such 
that" is designated by a reversed capital  "E".   Is this the symbol you are 
using?     m.a.
  ----- Original Message ----- 
  From: Bruno Marchal 
  To: everything-list@googlegroups.com 
  Sent: Saturday, June 06, 2009 4:36 PM
  Subject: Re: The seven step-Mathematical preliminaries 2





  We do have problem of symbols, with the mail. I don't see any rectangle in 
the message below!


  Take it easy and . We will go very slowly. It will also be the exam periods. 
There is no rush ...


  Have a good holiday


  Bruno



      ----- 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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