1. Dec 18, 2011 #1

   Tosh5457

   

   This one in this context
   
   I never understood what it means and I can't find its meaning...

    

   Tosh5457, Dec 18, 2011
2. 
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3. Dec 18, 2011 #2

   D H

   

   Staff Emeritus

   Science Advisor

   Insights Author

   It means union. In this particular case, it is the union, for all subsets G of the set T, of the sets of ordered pairs of the elements constructible from the set G.
   
   In other words, it is the set of all mappings (of functions) of T into itself.

    

   Last edited: Dec 18, 2011

   D H, Dec 18, 2011

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