Discuss whether or not the given function is injective, surjective, and/or bijective.

f: N into Q, where f(n) = 1/n

g: X subset of R^3 into [1,infinity), where g(x,y,z) = e^sqaure root of x^2+y^2+z^2-4

h: X subset of R^3 into R^3, where h(x) = 2x/2 norm of x