SOLUTION: if D= {-2, -1, 0, 1, 2} is D a subset of itself?

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Question 1121919: if D= {-2, -1, 0, 1, 2} is D a subset of itself?
Answer by ikleyn(52776) About Me  (Show Source):
You can put this solution on YOUR website!
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Yes, it is.

Such a subset is called "improper subset".