👉 In mathematics, a pyramidically defined function is a function that can be represented as the sum of two or more other functions. In other words, it is a function that has all its inputs and outputs in terms of a single variable, such as $x$, with a fixed input value determined by the function's domain. A pyramidically defined function is commonly used in calculus to represent functions that have derivatives involving multiple variables. For example, consider the function $f(x) = x^3 +
