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What does this symbol mean?

  1. Dec 18, 2011 #1
    This one jpfn29.png in this context 41ccd3754a1eb92f637734fcf743fe58.png

    I never understood what it means and I can't find its meaning...
  2. jcsd
  3. Dec 18, 2011 #2

    D H

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    Staff Emeritus
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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.
    Last edited: Dec 18, 2011
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