Mathematics, Discrete Mathematics, Programming.
defined by f(x) = x² + 1 Remember, this says that our function will take in integers as its input and will output natural numbers. Here is how our proof will go: Let a = 1 and b = -1 f(1) = ¹² + 1 = 2 f(-1) = (-1)² + 1 = 2 Since both 1 and -1 output 2, this function is NOT injective. Surjective A