The universal subset is the empty set. It is a subset of all sets.
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A number does not have a subset.
define a subset
The empty set is a subset.
An empty set is not a proper subset of an empty set.An empty set is not a proper subset of an empty set.An empty set is not a proper subset of an empty set.An empty set is not a proper subset of an empty set.
pi is a single number , not a set. Since it is not a set, it cannot have a subset.