👉 A surjective function is a mathematical concept that describes an operation or a mapping where each input value maps to exactly one output value. This means, given any input, there exists at least one output corresponding to it. For example, consider the function f(x) = x^2 + 1. If we have two inputs (x1 and x2), then for every possible y in the domain of f, there will be exactly one corresponding x such that: f(x1) = (
