Practice question · Match the pairs
Match each notation to what it expresses.
- a is a member of A
- A is a subset of B
- A union B
- A intersect B
- Every member of A is a member of B
- Everything in both sets
- An object belongs to a set
- Everything in either set
Hints
- Two entries are relations and two are operations.
- Relations hold or fail; operations produce a new set.
Show the answer
- a is a member of A → An object belongs to a set
- A is a subset of B → Every member of A is a member of B
- A union B → Everything in either set
- A intersect B → Everything in both sets
Why
Relations either hold or do not; operations build a new set from old ones. Keeping the distinction clear matters, since a relation cannot be a member of anything but the result of an operation can.
Practise Set Theory: Membership and Operations
The app has 4 more questions on this lesson, and keeps your place in the course. Philosophy I is free to start.
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