Mathematics — first biennium · Lesson
∈ is used between an element and a set. ⊂ marks a proper subset; ⊆ also allows the two sets to be equal.
In this lesson: Distinguish an element from a subset and deliberately use ∈, ⊂ and ⊆.
How to proceed: First decide whether the object on the left is an element or a set. Only then choose between membership and inclusion.
You can already assume: Set, element and membership.
Completed exercises: 0/5 · Correct on first attempt: 0
First decide whether the object on the left is an element or a set. Only then choose between membership and inclusion.
ConceptStep separates what is required from what is recommended or useful as reinforcement. Only required prerequisites block your progress.
Relationships: solid line = required · dashed line = recommended · dotted line = reinforcement.