- #1

honestrosewater

Gold Member

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After seeing infinite sets defined negatively, I liked seeing them defined as sets that are equivalent to one of their proper subsets. I always thought diagonal argument[/url] was cool.

Do you have a favorite definition, theorem, proof, bit of knowledge you found especially insightful or useful... ?

Do you have a favorite definition, theorem, proof, bit of knowledge you found especially insightful or useful... ?

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