This might be true in a programming language but it’s not for mathematical functions which is what they refer to in the first half of this paragraph.
I think what they mean is that two functions won’t have the exact same signature and result typings, though in practice this isn’t normally true for computer systems. Although there’s an argument that if it has those exact same things maybe you don’t need two functions but to improve your one function to be more robust.
I think what they mean is that two functions won’t have the exact same signature and result typings, though in practice this isn’t normally true for computer systems. Although there’s an argument that if it has those exact same things maybe you don’t need two functions but to improve your one function to be more robust.