👉 In mathematics, a concave function is a function that is not convex. This means that it has an inflection point at its vertex, which occurs when the second derivative of the function is zero. For example, consider the function f(x) = x^2 - 3x + 2. If we take the second derivative of this function, we get: f''(x) = 2x - 3 Setting this equal to zero gives us: 2x -