On modal renderings of intuitionistic propositional logic.
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On modal renderings of intuitionistic propositional logic.
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277 Notre Dame Journal of Formal Logic Volume VII, Number 3, July 1966
ON MODAL RENDERINGS OF INTUITIONISTIC PROPOSITIONAL LOGIC
NICHOLAS RESCHER
The intuitionistic propositional calculus (IPC) of Heyting 1 rests upon the following eleven axioms: (Al) p-*(p Λ p) (A2) (p Λ q) -> (q A p) (A3) (p^q) ->[(/> AT) ^{q AT)} (A4) [(p~*q) A(p^r)] -[p ^ r] (A5) q->(P~>q) (A6) [p A (p - q)] -> q (A7) p -> (/> v q) (A8) (pv q) ~>(q v p) (A9) [(/> - r) A (q -> r)] - [(/> v q) - r ] (A10) -Λp-^{p~*q) (All) [ ( p - ^ ) A ( p - π ^ ) ] - Ί ί Here the symbols ί — > > , ζ Λ ',tf v ', andtf π ' are used for intuitionistic implication, conjunction, disjunction, and negation, respectively. Moreover, there are certain theses which Heyting in his book of 1956 specifically and explicitly rejects as intuitionistically unacceptable: (Ul) (U2) (U3) (U4) (U5) (U6) (U7) (U8)
(p v q) ->(p v q) [See p. 97.] ~p-^np [See pp. 18-19, 97-98.] p vnp [See p. 99.] -i n />-/> [See p. 99. ] (/>->?) v (^ -> p) [See p. 99.] π (p A q) — ( π•/> v π ^ ) t S e e P 1 0 0 ] ( Ί m | ) ) - ( | ) - g ) [See p. 101.] Ί Ί ( ί v ί ) - ( Ί Ί / ι v -,-!
