Set, element and membership

Sets

The symbol ∈ links an element to a set; ∉ says that the element does not belong to the set.

Rule

Formula matematica

Example

Formula matematica

What you need to know before the exercises

In this lesson: Represent a finite set and correctly use the membership symbols ∈ and ∉.

How to proceed: Look at the objects on the two sides of the symbol: an element must be on the left and a set on the right.

You can already assume: No specific prerequisite.

Try it now

Translate correctly: “4 belongs to A”.

Guided

Completed exercises: 0/5 · Correct on first attempt: 0

How to reason

Look at the objects on the two sides of the symbol: an element must be on the left and a set on the right.

Formula matematica

Your competency map

ConceptStep separates what is required from what is recommended or useful as reinforcement. Only required prerequisites block your progress.

You can start right away. This is a foundation module: it does not require earlier skills from the learning path.