Download e-book for iPad: A Tour Through Mathematical Logic (Carus Mathematical by Robert S. Wolf

By Robert S. Wolf

ISBN-10: 0883850362

ISBN-13: 9780883850367

The principles of arithmetic comprise mathematical good judgment, set concept, recursion idea, version idea, and Gödel's incompleteness theorems. Professor Wolf offers right here a advisor that any reader with a few post-calculus event in arithmetic can learn, get pleasure from, and study from. it could actually additionally function a textbook for classes within the foundations of arithmetic, on the undergraduate or graduate point. The e-book is intentionally much less dependent and extra undemanding than normal texts on foundations, so can also be appealing to these outdoors the study room surroundings desirous to find out about the topic.

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Additional info for A Tour Through Mathematical Logic (Carus Mathematical Monographs)

Example text

Every variable and every constant symbol is a term. Also, if t1 , t2 , . . , tn are terms and f is an n-ary function symbol, then the string of symbols f (t1 , t2 , . . , tn ) is also a term. ) Having defined terms, we can then define the well-formed formulas, or simply formulas, of a first-order language. First of all, if t1 , t2 , . . , tn are terms and R is an n-ary relation symbol, then the string of symbols R(t1 , t2 , . . , tn ) is a formula. Equations of the form t1 = t2 are also formulas.

On the other hand, ZFC is in many ways an extremely simple theory. This is especially true of its language. The language of set theory has just one binary relation symbol ∈. It is not even necessary to include the equality symbol, since equality of sets can be defined (two sets being equal if and only if they have exactly the same elements). It is worth noting that ZFC is a “pure” set theory: all the objects under discussion are technically sets. There are not even variables or axioms Examples of first-order theories 37 for the natural numbers; every mathematical object must be a set.

Furthermore, there is absolutely no way in L, even using an infinite set of axioms, to express that a field has finite (that is, nonzero) characteristic! We will also see that these limitations are not just an esoteric curiosity; they lead to some questions that are of genuine interest to algebraists. If we want a theory in which we can work with concepts such as finite characteristic, subrings, and homomorphisms, we need to go beyond the first-order theory of rings and fields. As in Example 16, we could use a second-order theory, or we could use the full power of set theory.

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A Tour Through Mathematical Logic (Carus Mathematical Monographs) by Robert S. Wolf

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