how do you get a example of two real world sets?   evaluating functions

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Sets are everywhere.

Take for example the set of movies you have seen, and another set could be the set of movies that you have seen that you liked.   The set of red cars, the set of blue cars are all real world examples of sets.

You could write these...

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Sets are everywhere.

Take for example the set of movies you have seen, and another set could be the set of movies that you have seen that you liked.   The set of red cars, the set of blue cars are all real world examples of sets.

You could write these as

{x|x is a movie that I have seen},

{x|x is a movie that I liked}

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