This question links to a former discussion on the board. I'm confused regarding this thread:(adsbygoogle = window.adsbygoogle || []).push({});

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....

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# Abstract Algebra question

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