Download Logic for Computer Science by Steve Reeves PDF

By Steve Reeves

An figuring out of good judgment is key to computing device technological know-how. This ebook presents a hugely available account of the logical foundation required for reasoning approximately laptop courses and utilising common sense in fields like man made intelligence. The textual content comprises prolonged examples, algorithms, and courses written in average ML and Prolog. No previous wisdom of both language is needed. The e-book includes a transparent account of classical first-order common sense, one of many uncomplicated instruments for software verification, in addition to an introductory survey of modal and temporal logics and attainable global semantics. An advent to intuitionistic common sense as a foundation for a tremendous form of application specification is usually featured within the publication.

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If an occurrence of a variable v is not bound by any quantifier then that occurrence is a free occurrence. A sentence based on is a formula in which no free variables occur. An atomic formula with no free variables is an atomic sentence. For example, if a is a name and x is a variable then f(x, a) is a term, provided that f is a function symbol of arity two, (A Æ B(x, f(y, a))) is a formula in which x and y are free, "x$y(A Æ B(x, f (y,a))) is a sentence and R(a, b, c) is an atomic sentence.

Theorem If G, S H T then G H S Æ T, where S and T are any sentences and G is any set of sentences. ,Tn be a proof of T from assumptions G » {S}, so T n is T. We do induction on n. If n=1 then either T is in G or T is an instance of an axiom schema or T is S. In the first two cases G H T so since H T Æ (S Æ T) we have G H S Æ T. In the final case since H S Æ S we have G H S Æ T. Now assume that for any k, 1 ≤ k < n, the result holds. There are four possibilities. Either T is in G, or T is an instance of an axiom schema, or T is S, or T follows as a direct consequence by Modus Ponens from Ti and Tj, 1 ≤ i , j < n.

So, we have to show that the following is true: For any sentence S , if S is a theorem then S is a tautology and if S is a tautology then S is a theorem. This will allow us to claim that our formal system adequately characterizes our intuitive ideas about valid arguments, so we say that the italicized statement expresses the adequacy theorem for the formal system. The first part expresses the soundness of our formal system. It says that if we show that S is a theorem then it is a 43 tautology. In other words we only ever produce valid sentences as theorems.

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