Natural Deduction, Hybrid Systems and Modal Logics (Trends by Andrzej Indrzejczak

By Andrzej Indrzejczak

This ebook presents a close exposition of 1 of the main useful and renowned equipment of proving theorems in common sense, referred to as usual Deduction. it truly is awarded either traditionally and systematically. additionally a few combos with different recognized evidence equipment are explored. The preliminary a part of the publication bargains with Classical common sense, while the remaining is anxious with structures for numerous types of Modal Logics, essentially the most very important branches of contemporary common sense, which has vast applicability.

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Natural Deduction, Hybrid Systems and Modal Logics (Trends in Logic)

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We assume that quantifiers bind their arguments with the same strength as negation. An occurrence of a variable x in the scope of ∀x or ∃x is bound, otherwise it is free. A variable is bound (free) in a formula if it has at least one bound (free) occurrence in that formula. Note that a variable may be both free and bound in the same formula. ϕ(x) denotes a formula with free variable x (containing at least one free occurrence of x), V F (ϕ) (V F (Γ)) denotes the set of all free variables of formula ϕ (the set Γ).

Compound formulae are built as in the propositional case (including bracketing conventions) with addition of the following clause: • if ϕ ∈ F OR, then for any variable x, ∀xϕ, ∃xϕ ∈ F OR; ϕ is the scope of a quantifier. Note that propositional symbols are treated as predicate symbols of arity 0. For binary constant predicate = we apply usual convention writing τ1 = τ2 instead of = τ1 τ2 . We assume that quantifiers bind their arguments with the same strength as negation. An occurrence of a variable x in the scope of ∀x or ∃x is bound, otherwise it is free.

Clearly a succesfull refutation is just a (indirect) proof of ϕ, whereas failed (but somewhat completed), refutation is a disproof of ϕ. A proof (derivation) may have tree or linear structure. We focus on this subject later on (cf. Chapter 2) but notice that it is not only a difference of presentation. ), whereas in tree-proofs (T-proofs) we manipulate on their concrete occurrences labelling particular nodes of the tree. 4. – at least for ND systems. In what follows we will divide DS’s on T- and L-systems according to the form of a proof/derivation.

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