Algebra/Chapter 5/Functions

One-to-one function A function that for every input there exists an output unique to that input. Equivalently, we may say that a function is called one-to-one if for all implies that where A is the domain set of f and both x and x are members of that set.Horizontal Line Test' If no horizontal line intersects the graph of a function in more than one place then the function is a one-to-one function.