LAP 2013 Problems in formulating the consecution calculus of contraction less relevant logics
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1 LAP 2013 Problems in formulating the consecution calculus of contraction less relevant logics Mirjana Ilić, Branislav Boričić Faculty of Economics, Belgrade, Serbia Dubrovnik, September (LAP 2013) Formulating the consecution calculus of RW Dubrovnik, September / 21
2 RW RW is the relevant logic R [A. Anderson, N. Belnap Jr., Entailment: the logic of relevance and necessity, vol. 1, Princeton University Press, Princeton, New Jersey, p. 341] without the contraction axiom: (W ) (α.α β).α β Brady: RW is decidable logic [R. T. Brady, The Gentzenization and decidability of RW, Journal of Philosophical Logic, 19, 35-73, 1990.R. T. Brady, The Gentzenization and decidability of RW, Journal of Philosophical Logic, 19, 35-73, 1990.] (LAP 2013) Formulating the consecution calculus of RW Dubrovnik, September / 21
3 The Hilbert type formulation of RW Ax1. α α Ax2. α β.β γ.α γ Ax3. α.(α β) β Ax4. α β α Ax5. α β β Ax6. α β α γ..α (β γ) Ax7. α α β Ax8. β α β Ax9. (α γ) (β γ)..(α β) γ Ax10. α (β γ) (α β) (α γ) Ax11. α β..β α Ax12. α α R. α β α β R. α α β β (LAP 2013) Formulating the consecution calculus of RW Dubrovnik, September / 21
4 The first problem How to enable the inference of the distribution law: α (β γ)..(α β) (α γ) in the absence of the thinning rule? (LAP 2013) Formulating the consecution calculus of RW Dubrovnik, September / 21
5 The proof of the distribution law in Gentzen s LK and LJ α α β β α, β α (Thinning) α, β β (Thinning) α, β α β α, β (α β) (α γ) ( ) ( ) α, β γ (α β) (α γ) α (β γ), α (β γ) (α β) (α γ). α, γ (α β) (α γ) α (β γ) (α β) (α γ) α (β γ)..(α β) (α γ) ( ) ( ) (Contraction) ( ) (LAP 2013) Formulating the consecution calculus of RW Dubrovnik, September / 21
6 A puzzle α α α, β α (Thinning) α β α ( ) α (β α) ( ) The solution: we need two types of sequences of formulae [J. M. Dunn, A Gentzen system for positive relevant implication, The Journal of Symbolic Logic 38, pp , 1973.] [G. Minc, Cut elimination theorem for relevant logics, Journal of Soviet Mathematics 6, , 1976.] (LAP 2013) Formulating the consecution calculus of RW Dubrovnik, September / 21
7 The informal meaning of a Gentzen sequent α 1,..., α n β 1,..., β n (α 1... α n ) (β 1... β n ) A sequence of formulae appearing in the antecedent of a sequent in LJ and LK, represents the conjunction of those formulae. (LAP 2013) Formulating the consecution calculus of RW Dubrovnik, September / 21
8 Two different conjunctions in R (and in R + ) An effect of the absence of thinning: classical connectives split into dual pairs. extensional (truth functional) conjunction intensional conjunction (fusion) Γ[α] Γ[α β] Γ[β] Γ[α β] Γ[α, β] Γ[α β] Consequently, two types of sequences would be required to gentzenise R + : extensional sequences to stand in for ordinary extensional conjunction intensional sequences to stand in for fusion. (LAP 2013) Formulating the consecution calculus of RW Dubrovnik, September / 21
9 Intensional and extensional sequnces of formulae in LR + α α α, β α (Thinning) α α α α α, β α (extensional thinning) and α; β α (intensional thinning) α, β α is interpreted as α β α α; β α is interpreted as α β α (α β) γ..α (β γ) is valid, but (α β) γ..α (β γ) is not α; β α α, β α is valid, but α β α α β α is not. (LAP 2013) Formulating the consecution calculus of RW Dubrovnik, September / 21
10 The proof of the distribution law, in a two sided sequent system with both intensional and extensional sequences α α β β α, β α (KE ) α, β β α, β α β α, β (α β) (α γ) ( ) (KE ) ( ). α, β γ (α β) (α γ) α (β γ), α (β γ) (α β) (α γ) α (β γ) (α β) (α γ) α, γ (α β) (α γ) ( ) (WE ) ( ) (LAP 2013) Formulating the consecution calculus of RW Dubrovnik, September / 21
11 The second problem How to disable the inference of the modal fallacy: α (β β) in the presence of the cut rule? The empty left hand side in the left premise of the cut rule: can lead to irrelevance: β β Γ α Σ[Γ] β Σ[α] β β β β β α, β β β β (KE) α β β α.(β β) ( r) (cut) (LAP 2013) Formulating the consecution calculus of RW Dubrovnik, September / 21
12 A solution: The addition of t as primitive { t t (α α) Two approaches: Cut: Γ α Σ[α] β Σ[Γ] β (Γ non empty) α Σ[t] β Σ[α] β β β β β β β α, β β β β (KE) α, t β β (cut) Sequents must have non empty antecedents (they have t there instead). t β β β β β β α, β β β β (KE) α, t β β (cut) (LAP 2013) Formulating the consecution calculus of RW Dubrovnik, September / 21
13 A note: With the cut rule restricted to instances where Γ is non empty, only, the Cut Elimination would not be provable The proper form of the cut rule: π 1 Γ; α β Γ α β ( ) Γ π 2 π 3 α β α β ( ) (cut) Improper forms: α Γ β Γ; α β and α Γ Γ; α (LAP 2013) Formulating the consecution calculus of RW Dubrovnik, September / 21
14 Giambrone s Gentzen system for RW + The cut free Gentzen system LRW t of RW t t is added as a place filter to ensure the non emptiness of antecedents is added to provide the interpretation for intensional sequences The expansion of LRW t + to include empty antecedents. The Gentzen system of RW +. (LAP 2013) Formulating the consecution calculus of RW Dubrovnik, September / 21
15 The third problem How to add negation to Giambrone s LRW +? Brady s [R. T. Brady, The Gentzenization and decidability of RW, Journal of Philosophical Logic, 19, 35-73, 1990.] solution: LRW is the single conclusion sequent system based on signed formulae. Originally, to enable the inference of α α, Gentzen allowed multiple conclusion sequents: α α α; α ( ) ( ) α α α α ( ) (LAP 2013) Formulating the consecution calculus of RW Dubrovnik, September / 21
16 Problems with multiple conclusion sequents π 1 Γ 1 α; 1 π 2 Γ 1 β γ; 1 Γ 1 α (β γ); 1 ( ) Γ 1 ; Γ 2 1 ; 2 π 3 Γ 2 ; (α, β γ) 2 (Γ 2 ; α (β γ)), (Γ 2 ; α (β γ)) 2 ( ) Γ 2 ; α (β γ) 2 (WE ) (cut) The mix rule: Γ 1 α; 1 Γ 2 ; (α, Γ 3 ) 2 Γ 2 ; (Γ 1, Γ 3 ) 1 ; 2 π 2 Γ 1 β γ; 1 π 1 Γ 1 α; 1 π 3 Γ 2 ; (α, β γ) 2 Γ 2 ; (Γ 1, β γ) 1 ; 2 Γ 2 ; (Γ 1, Γ 1 ) 1 ; 1 ; 2 Γ 2 ; Γ 1 1 ; 1 ; 2 (WE ) permutations (mix) (mix) Γ 1 ; Γ 2 1 ; 1 ; 2 Γ 1 ; Γ 2 1 ; 2??? for non empty 1 (LAP 2013) Formulating the consecution calculus of RW Dubrovnik, September / 21
17 Brady s LRW T α T α F α T α T α T α (F ) (T ) T α α F α F α T α F α F α F α (T ) (F ) ( T ) The unusual second premise of the rule ( T ) is needed to pair with the rule (T ) in the mix elimination argument. (LAP 2013) Formulating the consecution calculus of RW Dubrovnik, September / 21
18 π 2 Γ T β γ π 1 π 3 Γ T α Γ ; (T α, T β γ) Sγ Γ ; (Γ, T β γ) Sγ Γ ; (Γ, Γ ) Sγ Γ ; Γ Sγ (WE ) permutations Γ ; Γ Sγ (cut) (cut) Brady s system contains over 50 inference rules. E. g. there are 8 different rules for : four of them for the rule (T ), two of them for (F ), one for ( F ) and one rule for ( T ), which is, unusually, two premise rule. (LAP 2013) Formulating the consecution calculus of RW Dubrovnik, September / 21
19 We ask How to obtain a Gentzen system of RW directly? We formulate the right handed sequent system GRW, based on multisets instead of sequences. A two sided sequent system is not suitable for RW. RW is commutative logic, therefore the use of multisets as data structures appears as most natural in this context. (LAP 2013) Formulating the consecution calculus of RW Dubrovnik, September / 21
20 Our system 1. We obtain the cut free Gentzen system GRW for RW directly (we do not proceed via extended system RW t ). 2. The inference rules of GRW are simple and natural. 3. The proof of the Cut Elimination Theorem in GRW is clear and simple. (LAP 2013) Formulating the consecution calculus of RW Dubrovnik, September / 21
21 Thank you! (LAP 2013) Formulating the consecution calculus of RW Dubrovnik, September / 21
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