By G. B Keene

ISBN-10: 0486155005

ISBN-13: 9780486155005

This textual content unites the logical and philosophical elements of set conception in a way intelligible either to mathematicians with no education in formal common sense and to logicians with no mathematical history. It combines an easy point of therapy with the top attainable measure of logical rigor and precision. 1961 version.

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**Extra info for Abstract Sets and Finite Ordinals. An Introduction to the Study of Set Theory**

**Example text**

2, p. 38). Now the theory of pairs, ordered pairs and k-tuplets which is a fundamental part of the system, concerns operations which are confined to sets. The nature of these operations is, however, quite independent of the domain of discourse to which they are applied. We shall, therefore, use the word “set” ab initio, despite the fact that the distinction between a set and a class has yet to be explained. 11. Pairs and Ordered Pairs It will be shown in the next section that sets whose only member is some given set, and sets whose only members are either some given set or another given set, exist for this system.

This may be represented as follows: Figure 13 ∪C =df the class defined by: [(∃z)(z ε C ⋅ x ε z)] Manifold Product The manifold product (or intersection of the elements) of a class C of classes is the class of members of every member of that class. It is, therefore, the class defined by: “… is a member of every member of C”. This may be represented as follows: Figure 14 ∩C =df the class defined by: [(z)(z ε C ⊃ x ε z)] Unit-class and Pair-class The unit class of a class C is the class whose sole member is C; similarly the pair-class of the classes C and D is the class whose sole members are C and D.

All that is required is an understanding of the meaning and interrelation of the following symbols: ∼, , v, ⊃, ≡, (x)φ, (∃x)φ, ε All of them translate straightforwardly into a familiar word or phrase of ordinary speech. But they are not mere shorthand symbols. For each differs from its counterpart in ordinary speech in virtue of the fact that it is precisely defined; whereas the words of ordinary speech are not. We shall formulate, explain and illustrate the definition of each in turn. In doing so we shall make use of the two groups of letters: x,y,z,w, and: P,Q,R,S, which we call variables.

### Abstract Sets and Finite Ordinals. An Introduction to the Study of Set Theory by G. B Keene

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