In mathematics, and more specifically set theory, the empty set is the unique set having no elements; its size or cardinality (count of elements in a set) is zero. Some axiomatic set theories assure that the empty set exists by including an axiom of empty set; in other theories, its existence can be deduced. Many possible properties of sets are trivially true for the empty set.
Null set was once a common synonym for "empty set", but is now a technical term in measure theory.
Read more about Empty Set: Notation, Properties
Famous quotes containing the words empty and/or set:
“There are times when words seem empty and only actions seem great. Such a time has come, and in the Providence of God America will once more have an opportunity to show the world that she was born to save mankind.”
—Woodrow Wilson (1856–1924)
“It’s the set of the soul that decides the goal,
And not the storms or the strife.”
—Ella Wheeler Wilcox (1850–1919)