SOLUTION: if D= {-2, -1, 0, 1, 2} is D a subset of itself?
Algebra.Com
Question 1121919: if D= {-2, -1, 0, 1, 2} is D a subset of itself?
Answer by ikleyn(52778) (Show Source): You can put this solution on YOUR website!
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Yes, it is.
Such a subset is called "improper subset".
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