(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.domain.name.hidden 
  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.domain.name.hidden
      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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Received on Sat Jun 06 2009 - 17:54:41 PDT