That would be an Impossible equation...
It's called a paradox, something like
This statement is false.
Chat with our AI personalities
No, by definition. A proper subset is a subset that contains some BUT NOT ALL elements of the original set.
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
Every set contains the empty set. Every set is a subset of itself.
The null set. Every set is a subset of itself and so the null set is a subset of the null set.
The only subset of an empty set is the empty set itself.