Logik wrote: ↑Thu Apr 25, 2019 6:59 pm
PeteOlcott wrote: ↑Thu Apr 25, 2019 6:58 pm
You can show how the sound deductive logical inference model is either incomplete or inconsistent?
"incompleteness" and "inconsistency" are synthetic notions. Formalize them.
You are using the wrong meaning of synthetic. You are not using the one from philosophy.
The one from philosophy corresponds to Kant's a posteriori.
Here is consistency and completeness formalized:
Formalizing the Sound Deductive Inference Model in Symbolic Logic
Axiom(0) Stipulates** this definition of Axiom:
Expressions of language defined to have the semantic value of Boolean True.
Provides the symbolic logic equivalent of true premises.
Stipulating** this specification of True and False: (TRUE ↔ ⊤ ∧ FALSE ↔ ⊥)
Axiom(1) ∀F ∈ Formal_System ∀x ∈ Closed_WFF(F) (True(F, x) ↔ (F ⊢ x))
Axiom(2) ∀F ∈ Formal_System ∀x ∈ Closed_WFF(F) (False(F, x) ↔ (F ⊢ ¬x))
Thus stipulating** that consequences are provable from axioms.
Stipulating** that formal systems are Boolean:
Axiom(3) ∀F ∈ Formal_System ∀x ∈ Closed_WFF(F) (True(F,x) ∨ False(F,x))
Screens out semantically unsound sentences as not belonging to the formal system.