more from Graham Priest

### Single Idea 9682

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

Full Idea

X ∪ Y indicates the 'union' of sets X and Y, which is a set containing just those things that are in X or Y (or both).

Gist of Idea

X∪Y indicates the 'union' of all the things in sets X and Y

Source

Graham Priest (Intro to Non-Classical Logic (1st ed) [2001], 0.1.8)

Book Reference

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