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Mathematics in Senior One: ① Can a number equal to 2 form a set? ② Can {1,1} form a set?
① Can a number equal to 2 form a set?

Can form a collection, which can be expressed by enumeration as: {2}

② Can {1,1} form a set?

I can't. The elements in the set need to satisfy mutual anisotropy (the elements in the set must be different from each other).