QUESTION 1: Determine if the function f: Z -> Z, f(n) = n-1 is injective. Show your work on paper, and then upload the image here. Attach File.
QUESTION 2: Show that the function f: Z x Z -> Z, f(n, m) = n-m is an onto function. Show your work on paper and upload the image of it here. Attach File.
QUESTION 3: Determine if the function f: R -> Z, defined by f(x) = |_(_())(x)/((3)_(_()))| is a bijection. Justify your answer. Show your work on paper, and then upload here. Attach File.