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It's for sure a bad set of examples.

There have been several queens of England. At the very least you should know Bloody Mary, if not for the Tudor's legacy of a golden age with Queen Elizabeth (another queen!), then for the goddamn alcoholic drink. And I'm not even British.

"The set of all red balls contains just one ball."

There are many reds too...

It's just unintuitive to try to force "intuitive" examples into a mathematical framework... Might as well just do it the right, formal way.



I think it is referring to the concept of one ruler at a time 'The King is dead, long live the king' means there is only one king, one is gone, and in same sentence the new one is in place. There is only ever one.




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