👉 Underbranch in a context of mathematics refers to an element or function that is not directly related to its parent functions or variables. For example, if we have two variables x and y, where x = 3 + 4y, then the value of y will depend on the value of x, but it doesn't change when we substitute a new value for x into the equation. In mathematical terms, an underbranch is defined as a variable or function that is not directly related to its parent