👉 In mathematics, an epigraph is a graph that represents all possible outcomes or values of a function. It is used to describe the range of a real-valued function on a domain, and it can be used to visualize how different inputs or outputs affect the output of the function. An example of an epigraph could be a piecewise-defined function where each part describes a specific value (or set of values) that the function might produce. For instance, consider a function f(x) = x