Additional Axiom of Arithmetic
Newberry 2022-03-11
Let P_1, P_2, … P_7 be the Peano axioms. What will happen if we add
P+: P1 & P2 & … P7 & ?x(Prf(x, ?P?) ? P
Here ?P? means the Gödel number of P, and Prf(x,y) means that x is a proof o y, or rather that x is the Gödel number of a sequence that is a proof a sentence with Gödel number y.
It seems to me that the axiom is true. For if our derivation system is sound, and it derives P then it is the case that P.
P+: P1 & P2 & … P7 & ?x(Prf(x, ?P?) ? P
Here ?P? means the Gödel number of P, and Prf(x,y) means that x is a proof o y, or rather that x is the Gödel number of a sequence that is a proof a sentence with Gödel number y.
It seems to me that the axiom is true. For if our derivation system is sound, and it derives P then it is the case that P.
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