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By this “a priori” assumption I am referring to the uses of real and complex numbers as the fundamental mathematical language in terms of which the theory is formulated. (For example the use of continuum to describe space time etc). In order to avoid such an “a priori” unjustified conception, what is needed is an abstract generalization of a Physics Theory such that Quantum Mechanics is seen as a particular application of this general construct.…the description of space time using set theoretical concepts seems to be rather questionable. In fact it would seem that most of the infinities and renormalization problems, which arise in the Classical Theory of Gravity, are due to the current description of spacetime.