Determining if Injective (One to One)

To assess whether a function is injective (also referred to as one-to-one), it's essential to verify that each input correlates to a distinct output. If there's even a single instance where two diverse inputs yield the same output, the function fails to be injective. A convenient way to visually confirm this is by examining a graph; if any horizontal line intersects the curve more than once, the function is not one-to-one.