Let X = {x2 : x ∈ N} and the function f : N → X is defined by f(= x2, x ∈ N. Then this function is
A. injective only
B. not bijective
C. surjective only
D. bijective
Answer:D
Let X = {x2 : x ∈ N} and the function f : N → X is defined by f(= x2, x ∈ N. Then this function is
A. injective only B. not bijective C. surjective only D. bijective