Yes - because, if something is an object of the null set, then it is also an element of the other set. Since nothing is an element of the empty set, the above statement is trivially true.
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The null set. Every set is a subset of itself and so the null set is a subset of the null set.
Yes the null set is a subset of every set.
The null set. It is a subset of every set.
No. The null set cannot have a proper subset. For any other set, the null set will be a proper subset. There will also be other proper subsets.
Yes. One of the subsets is the set itself. The other is the null set.