👉 In mathematics, a concave function is a function that has its graph opening downward or upward (with respect to the x-axis), instead of upwards or downwards (with respect to the y-axis). This means that for any given input value, the output will be less than or greater than the corresponding input. The term "concave" refers to this property of the function.
For example, consider a quadratic function f(x) = ax^2 + bx + c, where a ≠ 0
concave