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Download e-book for iPad: An Introduction to Non-Classical Logic by Graham Priest

By Graham Priest

ISBN-10: 0521790980

ISBN-13: 9780521790987

ISBN-10: 052179434X

ISBN-13: 9780521794343

This revised and significantly accelerated 2d version brings jointly a variety of themes, together with modal, annoying, conditional, intuitionist, many-valued, paraconsistent, appropriate, and fuzzy logics. half 1, on propositional good judgment, is the outdated creation, yet comprises a lot new fabric. half 2 is solely new, and covers quantification and identification for all of the logics partly 1. the cloth is unified via the underlying topic of worldwide semantics. all the issues are defined basically utilizing units akin to tableau proofs, and their relation to present philosophical matters and debates are mentioned. scholars with a uncomplicated knowing of classical common sense will locate this ebook a useful creation to a space that has turn into of valuable significance in either good judgment and philosophy. it is going to additionally curiosity humans operating in arithmetic and desktop technology who desire to learn about the realm.

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Additional info for An Introduction to Non-Classical Logic

Sample text

Its height is therefore less than or equal to 5. At the moment, nothing allows us to claim that its height is exactly 5. Might we not, in fact, imagine a second way of decomposing this formula which would lead to a shorter tree? 3) is that for every formula F E F, there is at least one decomposition of the type we have just exhibited. 10, will be proved by induction on the set of formulas. 4 The unique decomposition theorem For each word W E W(A), let us agree to denote by o[W] (respectively: e[W]) the number of opening (respectively: closing) parentheses that occur in W.

Or else G is a sub-formula of F I, and, by the induction hypothesis, the formula F{, which results from substituting H for G in F], is logically equivalent to F I. Then the formula F' is the formula (F{ ;\ F2); it is logically equivalent to F because, for any assignment 8, we have The argument is strictly similar in the third case, when G is a sub-formula of F2. 18. In practice, to show that a formula is a tautology, or that two formulas are logically equivalent, we have several methods available.

2 . 20 • A tautology is a formula that assumes the value 1 under every assignment of truth values. 28 PROPOSITIONAL CALCULUS • the notationfor 'F is a tautology' is: 1-* F; whereas J,L* F signifies: 'F is not a tautology'. • Given two formulas F and G, F is logically equivalent to G ifand only formula (F {} G) is a tautology. The notation for' F is logically equivalent to G' is: F ~ if the G. 21 The next two properties follow immediatelyfrom these definitions: • For allformulas F and G, we have F ~ G if and only iffor every assignment of truth values 0 E {O, I}P, 8(F) = 8(G).

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An Introduction to Non-Classical Logic by Graham Priest


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