Abstract Algebra question

  1. This question links to a former discussion on the board. I'm confused regarding this thread:

    http://https://www.physicsforums.com/showthread.php?t=3622

    Specifically, towards the end of the thread, the asker states (in regards to the union notation originally cited):

    "....if we say that x is an element of the union of those sets, then we know x is an element of at least one of those sets. "

    I thought the "or" conditional of the union meant that one (and only one) match occurs for x for the notation to be true. I could be wrong....:biggrin:
     
  2. jcsd
  3. Nope. "Or" always means non-exclusive or.
     
  4. Got it, thanks....
     
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