more from Graham Priest

### Single Idea 9681

#### [catalogued under 4. Formal Logic / F. Set Theory ST / 2. Mechanics of Set Theory / a. Symbols of ST]

Full Idea

X = Y means the set X equals the set Y, which means they have the same members (i.e. X⊆Y and Y⊆X).

Gist of Idea

X = Y means the set X equals the set Y

Source

Graham Priest (Intro to Non-Classical Logic (1st ed) [2001], 0.1.6)

Book Reference

Priest,Graham: 'Introduction to Non-Classical Logic' [CUP 2001], p.-6