set([x - y >= 0 , y  - x >= 0])    returns   {x - y >= 0}  ?  

I think it attempts to evaluate the terms x - y >= 0  which becomes False  
and y - x >= 0  which is also False and assume both are the same.  Totally 
not what I would expected  --  in fact   x - y >= 0 should not be 
'evaluated'  to  0.  

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