What does this symbol mean?

  • Thread starter Tosh5457
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  • #1
Tosh5457
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This one
jpfn29.png
in this context
41ccd3754a1eb92f637734fcf743fe58.png


I never understood what it means and I can't find its meaning...
 

Answers and Replies

  • #2
D H
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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.
 
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