Let A = {x : -1 ≤ x ≤ 1} and f : A → A is a function defined by f(= x |x| then f is
A. a bijection
B. injection but not surjection
C. surjection but not injection
D. neither injection nor surjection
Answer:A
Let A = {x : -1 ≤ x ≤ 1} and f : A → A is a function defined by f(= x |x| then f is
A. a bijection B. injection but not surjection C. surjection but not injection D. neither injection nor surjection