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並前往https://www.reddit.com/r/MathHelp/comments/akrctq/wtf_is_a_subset_and_a_proper_subset_and_what_is/

Wtf is a subset and a proper subset and what is the difference ...

Now as for subset vs. proper subset. Think about what I've just written, a subset is a collection of of objects from some set, so that makes ...

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