Not just Leibniz notation, but for example https://en.wikipedia.org/wiki/Partial_derivative https://en.wikipedia.org/wiki/Partial_derivative is total bonkers,

Not just Leibniz notation, but for example https://en.wikipedia.org/wiki/Partial_derivative https://en.wikipedia.org/wiki/Partial_derivative is total bonkers, every single equation on it means the total opposite than in the rest of the mathematics. Wtf is > the partial derivation of a function f(x,y,z...) or deriving a function respect to a variable? Functions don't have variables, named variables, that's Python, not math[0]. In math expressions can have free variables, and function arguments are indexed with numbers. You can derive x+y by x, or you can derive f : (x,y) |-> x+y by its first variable, but you can't mix them. That only leads to things as df(x,x)/dx and such abominations. Multivariable calculus people really should just adopt the function notation of the rest of the mathematics fr. [0] : https://en.wikipedia.org/wiki/Function_(mathematics)#Definition https://en.wikipedia.org/wiki/Function_(mathematics)#Definit...