Answer: I(x) = x for all x ∈ A.
- A I(x) = −x for all x ∈ A
- B I(x) = x for all x ∈ A
- C I(x) = 0 for all x ∈ A
- D I(x) = 1 for all x ∈ A
Correct answer: B. I(x) = x for all x ∈ A
Explanation: The identity map leaves every element unchanged.
Concept context
Types of relations, equivalence classes, one-one and onto functions, composition, and invertible functions