Stage 19 · Sets & Intervals — the Language of Functions

19.3.4 The Empty Set Is a Subset of Every Set

19.3 Between One Set and Another

Point 4 of 5

19.3.4 The Empty Set Is a Subset of Every Set

Core idea

The empty circle never causes trouble and fits inside anyone, so ∅⊆A always holds.

Module goal. Use the "circle inside a circle" picture to understand subsets, proper subsets, and equality, building comparisons between sets
eastmath.com · 19.3 Between One Set and Another · 19.3.4 The Empty Set Is a Subset of Every Set