Mathematics

Problem

Which of the following statements best describes a surjective (onto) function

f:A\to B

? a) Every element of

A

has an image in

B

. b) Every element of

B

is the image of at least one element of

A

. c) Each element of

A

maps to a unique element of

B

. d) Each element of

A

maps to a distinct element of

B

and every element of

B

is an image.