Stefan Bilaniuk's A Problem Course in Mathematical Logic PDF

By Stefan Bilaniuk

ISBN-10: 0195046722

ISBN-13: 9780195046724

ISBN-10: 0387902430

ISBN-13: 9780387902432

ISBN-10: 0387903461

ISBN-13: 9780387903460

ISBN-10: 0394745027

ISBN-13: 9780394745022

This can be the amount II of a textual content for a problem-oriented undergraduate path in mathematical good judgment. It covers the fundamentals of computability, utilizing Turing machines and recursive services, and Goedel's Incompleteness Theorem, and will be used for a one semester path on those themes. quantity I, Propositional and First-Order common sense, covers the fundamentals of those issues in the course of the Soundness, Completeness, and Compactness Theorems. info on availability and the stipulations less than which this publication can be utilized and reproduced are given within the preface.

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We will use S m 0 to represent the natural number m in LN . ) Second, if ϕ is a formula of LN with all of its free variables among v1 , . . , vn , and m0, m1, . . , mn are natural numbers, we will write ϕ(S m1 0, . . e. ϕ with every free occurrence of vi replaced by S mi 0. Note that since the term S mi 0 involves no variables, it must be substitutable for vi in ϕ. 2. Suppose Σ is a set of sentences of LN . A k-place function f is said to be representable in Th(Σ) = { τ | Σ τ } if there is a formula ϕ of LN with at most v1, .

Gm are k-place functions and h is an m-place function, all of them representable in Th(A). Then f = h ◦ (g1 , . . , gm ) is a k-place function representable in Th(A). 6. Suppose g is a k + 1-place regular function which is representable in Th(A). Then the unbounded minimalization of g is a k-place function representable in Th(A). Between them, the above results supply most of the ingredients needed to conclude that all recursive functions and relations on the natural numbers are representable.

To make sense of this, of course, we first need to define what “definable in N means. 1. A k-place relation is definable in N if there is a formula ϕ of LN with at most v1, . . , vk as free variables such that P (n1 , . . , nk ) ⇐⇒ N |= ϕ[s(v1|n1 ) . . (vk |nk )] for every assignment s of N. Such a formula ϕ is said to define P in N. A definition of “function definable in N” could be made in a similar way, of course. 8. Suppose P is a k-place relation which is representable in Th(A). Then P is definable in N.

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A Problem Course in Mathematical Logic by Stefan Bilaniuk

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