### Single Idea 17752

#### [catalogued under 4. Formal Logic / F. Set Theory ST / 3. Types of Set / b. Empty (Null) Set]

Full Idea

The empty set is mainly a mathematical convenience - defining a set by describing the properties of its members in an involved way, we may not know from the very beginning what its members are.

Gist of Idea

The empty set is useful for defining sets by properties, when the members are not yet known

Source

Michal Walicki (Introduction to Mathematical Logic [2012], 1.1)

Book Reference

Walicki,Michal: 'Introduction to Mathematical Logic' [World Scientific 2012], p.45