Full Idea
The 'empty set' or 'null set' is a set with no members.
Gist of Idea
The 'empty set' or 'null set' has no members
Source
Graham Priest (Intro to Non-Classical Logic (1st ed) [2001], 0.1.4)
Book Reference
Priest,Graham: 'Introduction to Non-Classical Logic' [CUP 2001], p.-7