# An Outline of Set Theory by James M. Henle By James M. Henle

This e-book is designed to be used in a one semester problem-oriented direction in undergraduate set concept. the mix of point and layout is a bit strange and merits an evidence. ordinarily, challenge classes are provided to graduate scholars or chosen undergraduates. i've got stumbled on, notwithstanding, that the event is both priceless to dull arithmetic majors. i take advantage of a contemporary amendment of R. L. Moore's well-known technique constructed lately via D. W. Cohen . in brief, during this new technique, initiatives are assigned to teams of scholars each one week. With the entire important the help of the teacher, the teams whole their initiatives, conscientiously write a quick paper for his or her classmates, after which, within the unmarried weekly classification assembly, lecture on their effects. whereas the em­ phasis is at the pupil, the teacher is offered at each level to guarantee good fortune within the learn, to provide an explanation for and critique mathematical prose, and to teach the teams in transparent mathematical presentation. the subject material of set thought is above all acceptable to this variety of direction. for far of the e-book the gadgets of research are established and whereas the theorems are major and infrequently deep, it's the equipment and ideas which are most crucial. the need of rea­ soning approximately numbers and units forces scholars to come back to grips with the character of evidence, good judgment, and arithmetic. of their learn they event an identical dilemmas and uncertainties that confronted the pio­ neers.

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A cardinal K is regular if whenever X UX < K. If K is not regular we say it is singular. ~ K, IIXII < K, then PROJECT # 36. 5. Theorem. ill is regular. 6. Theorem. ~(l) is singular. 7. Theorem. If we assume AC, then ~l is regular. Definition. A cardinal K > ill is strongly inaccessible if it is regular and if whenever IIXII < K, IIP(X)II < K. Note that IIP(X)II makes sense only if we can well-order P(X). 39 8. The Universe PROJECT # 37. 8. Theorem. 9. Theorem (A C). If II~II and ~Q) are not strongly inaccessible.

The Axiom of Choice implies Zermelo's Theorem. 2. Theorem. Zermelo's Theorem implies Zorn's Lemma. PROJECT # 40. 3. Theorem. Zorn's Lemma implies the Axiom of Choice. 10. Definition. 0/1 £; P(ro) is a (non-principal) ultrafilter on ro iff (a) if A, BEo/1 then A n BEo/1, (b) if IIAII < ro then ro\AEo/1, and (c) for all A £; ro, either A or ro\A is in 0/1. 4. Theorem. There is an ultrafilter on ro. For the rest of this chapter, let 0/1 be an ultrafilter on ro. Assume, furthermore, all the usual facts about the real numbers which we did not prove in Chapter 5.

It is remarkable in many ways. First, it is such a surprising statement that it is hard to believe it is true. Second, while the theorem is entirely about finite integers, Goodstein's proof uses infinite ordinals. Third, 37 years after Goodstein's proof appeared, L. Kirby and J. Paris proved that the use of infinite sets is actually necessary. That is, this is a theorem of arithmetic that can't be proved arithmetically, but only by using the extra powers of set theory! " Take a number, for example, 23.

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