Decision to make: this confusion between 'create' and 'demonstrate' must stop. A proof reveals an equivalence; it does not create it; the distinction is fundamental for robust models. We must ensure that our mathematical foundations are intrinsically solid, and not just accepted because a demonstration exists. For example, in the calculations of present value of pension obligations, the equivalence between different sensitivity methods must be an inherent property of the system and not depend on the researcher who proves it.