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Any set has the empty set as subset

A is a subset of B if each element of A is an element of B

For the empty set ∅ the vacuum property holds

For every element of ∅ whatever property holds, also being element of an arbitrary set B, therefore ∅ is a subset of any set, even itself

∅ has an unique subset: itself

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Q: Why every set has an empty set?
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