Universal set.
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The null set. It is a subset of every set.
Yes.
A null set is a set with nothing in it. A set containing a null set is still containing a "null set". Therefore it is right to say that the null set is not the same as a set containing only the null set.
No. Let A = {a} (a singleton set) then P(A) = {a, 0} where 0 is the null (empty) set.
The null set. Every set is a subset of itself and so the null set is a subset of the null set.