# An Outline of Set Theory by James M. Henle

By James M. Henle

This booklet is designed to be used in a one semester problem-oriented direction in undergraduate set thought. the mix of point and layout is a little strange and merits a proof. quite often, challenge classes are provided to graduate scholars or chosen undergraduates. i've got discovered, although, that the adventure is both necessary to dull arithmetic majors. i take advantage of a contemporary amendment of R. L. Moore's well-known procedure constructed lately by means of D. W. Cohen [1]. in brief, during this new strategy, initiatives are assigned to teams of scholars each one week. With the entire useful the aid of the teacher, the teams entire their tasks, conscientiously write a brief 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 on the market at each degree to guarantee good fortune within the examine, 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 certainly applicable to this kind of direction. for far of the publication the gadgets of research are time-honored and whereas the theorems are major and infrequently deep, it's the tools and concepts which are most crucial. the need of rea­ soning approximately numbers and units forces scholars to return to grips with the character of evidence, common sense, and arithmetic. of their study they adventure a similar dilemmas and uncertainties that confronted the pio­ neers.

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Example text

By Replacement, qJ defines a function g, and 9 satisfies the requirements of the theorem. 13. Suppose B is well-ordered by

3) I +m J must be infinitesimal. (4) H' m [f01h must be infinite. (5) I' m [f100]~ must be infinitesimal. (6) There is a largest finite hyperreal. (7) There is a largest infinite hyperreal. (8) Th~re is a smallest infinite, positive hyperreal. (9) sin2(H) +m cos 2(H) = [f1h. HR has a least upper bound. HR. HR is an extension of IR. HR contains other numbers as well, infinite numbers and infinitesimals. HR. 10. Theorem. ] ~ is either infinitesimal or [fo] ~. CHAPTER 10 Goodstein's Theorem For nothing worthy proving can be proven, Nor yet disproven Alfred Lord Tennyson This chapter is devoted to a remarkable theorem proved by R.

Theorem. For r, IR, X =I CHAPTER 6 The Ordinals A mathematician is a blind man in a dark room looking for a black hat which isn't there. Charles Darwin We wish to extend N, our set of counting numbers, to a larger class of numbers we can use to count infinite sets. These will be our first type of infinite number, and they will be used to measure the "lengths" of large sets. Definition. A linear ordering on X is a well-ordering if every nonempty subset of X has a least element. A set with a well-ordering is said to be well-ordered.