Why is an empty set a proper subset of any nonempty set If the set a = {1,2,3,}, is the empty set a subset of the set

Why is an empty set a proper subset of any nonempty set If the set a = {1,2,3,}, is the empty set a subset of the set

Why is an empty set a proper subset of any nonempty set
If set a = {1,2,3,}, is the empty set still a subset of this set? --- I can tell you responsibly: Yes~

An empty set is a proper subset of any set______ ．

According to the meaning of the question, if an empty set is a subset of any set and a proper subset of any nonempty set, that is to say, an empty set is not a proper subset of itself, then the original proposition is wrong, so the answer is ×

An empty set is a proper subset of any set______ ．

According to the meaning of the question, if an empty set is a subset of any set and a proper subset of any nonempty set, that is to say, an empty set is not a proper subset of itself, then the original proposition is wrong, so the answer is ×