Haven't seen anyone mention that "-" is not a function at all. it is a symbol. A symbol which bound to the function which does subtraction. Users are free to r

Haven't seen anyone mention that "-" is not a function at all. it is a symbol. A symbol which bound to the function which does subtraction. Users are free to redefine it outright, or to redefine it it multiple ways in different scopes of their application. (Not sure how wise this would be, but not really the point ...) Not to be offensive, but the question as written seems to imply looking at lisp from preconcieved notions from other languages that probably don't make sense to carry over in understanding lisp.