You have probably encountered functions before. In introductory calculus, for instance, you typically deal with functions from real numbers to real numbers (e.g., the function f(x) = x^2). More gene...You have probably encountered functions before. In introductory calculus, for instance, you typically deal with functions from real numbers to real numbers (e.g., the function f(x) = x^2). More generally, functions “send” elements of one set to elements of another set; these sets may or may not be sets of real numbers. We provide below a “good enough for government work” definition of a function.
