The definition of a formal proof is intended to capture the concept of proofs as written in the practice of mathematics. The soundness of this definition amounts to the belief that a published proof can, in principle, be converted into a formal proof. However, outside the field of automated proof assistants, this is rarely done in practice. A classic question in philosophy asks whether mathematical proofs are analytic or synthetic. <MASK>, who introduced the analytic–synthetic distinction, believed mathematical proofs are synthetic.
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Kant Frege Spinoza Leibniz