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    Made withinDC&Austin
    F is assumed to be consistent — Carmelics
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    Home/Modality & Possibility
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    Supports→F cannot prove G_F if F proves the negation of G_F, assuming F is consistent
    Supports→The Gödel sentence G_F is true (when F is consistent and the provability predicate is a Σ⁰₁-formula)

    F is assumed to be consistent

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    F cannot prove G_F if F proves the negation of G_F, assuming F is consistentF proves the negation of G_F (assumption for conditional proof)F ⊢ Prf_F(n̲, ⌈G_F⌉) would contradict Gödel's incompleteness theoremG_F is provably equivalent to the universal formula ∀x¬Prf_F(x, ⌈G_F⌉) when the ...

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    If F proves both G_F and the negation of G_F, then F is simply inconsistentIf G_F were false, there would be a number n such that F ⊢ Prf_F(n̲, ⌈G_F⌉)The Gödel sentence G_F is true (when F is consistent and the provability predica...Universal formulas of this form can be proved false whenever they are in fact fa...

    Similar

    NFSI is consistent93%F is assumed to be 1-consistent90%Arithmetic is consistent (contains no contradictions).88%Peano Arithmetic (PA) is consistent.87%

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    SEP: goedel-incompleteness
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    In fact, in favourable circumstances, it can be shown that \(G_F\) is true, provided that \(F\) is indeed consistent. This is the case if, for example, the provability predicate \(\Prov_F (x)\) has been chosen as a \(\Sigma^{0}_1\)-formula: The Gödel sentence is then provably equivalent to the universal formula \(\forall x\neg\Prf_F (x, \ulcorner G_F\urcorner)\). Such formulas can be proved false whenever they in fact are false: if false, there would be a number \(\boldsymbol{n}\) such that \(F

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