By G. B Keene

ISBN-10: 0486155005

ISBN-13: 9780486155005

This textual content unites the logical and philosophical elements of set concept in a way intelligible either to mathematicians with out education in formal common sense and to logicians with out a mathematical heritage. It combines an straight forward point of remedy with the top attainable measure of logical rigor and precision. 1961 variation.

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

**Example text**

65). In the following pages a small part of the Bernays System has been expanded and set into a formal framework. This framework has been devised with the sole aim of combining, as far as possible, simplicity with formality. The result neither is nor is intended to be a completely rigorous formalization of the Bernays System. The definitions and the proofs of the major theorems are, for the most part, symbolizations of the definitions and proofs given by Bernays. Many of the other proofs, however, may well fall short of the elegance with which Bernays himself would have formally proved them.

For example, if we use Pr to name the class of prime numbers we can construct the propositional function: (x ε Nn) ⋅ (x ε Pr) Here, the following individuals are in the range of values concerned: 1 2 3 4 … etc. If we substitute each of these in turn for the variable x in the above propositional function, we have the following propositions: (1 ε Nn) ⋅ (1 ε Pr) (2 ε Nn) ⋅ (2 ε Pr) (3 ε Nn) ⋅ (3 ε Pr) (4 ε Nn) ⋅ (4 ε Pr) From the definition of “prime number” and the definition of “⋅”, it follows that the first three of these propositions are true and the last one, false.

In this way we are able, as in proofs we need to be able, to make assertions about a supposed individual, even when we are not in a position to specify the actual individual in question. Analogously, we can always infer from the premise that a propositional function holds universally, the conclusion that it holds for any particular individual with which we may be concerned. For example, from: we may infer: where k is the name of a particular individual. Or we may, if we wish, merely infer a propositional function, say, where z is any variable we like to choose, whether or not we have made use of it earlier in the proof.

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

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