There is only one empty set - the universal empty set. It is a set that contains no elements.
It is usually denoted by { } or the Greek letter phi = Φ (not pi = π).
Chat with our AI personalities
Help
Yes, both have cardinality 0.
No, only if both sets are empty. The intersection of disjoint sets is always empty.
empty set or null set is a set with no element.
Not necessarily. The odd integers and the even integers are two infinitely large sets. But their intersection is the null (empty) set.