21-603 Model Theory I
Rami Grossberg (Rami@cmu.edu)
URL: www.math.cmu.edu/~rami
MWF 10:30-11:20AM, BH 231A
Starting date: Monday, January 12, 2004
12 Units

General: Model theory is one of the four major branches of mathematical logic, and has a number of applications to algebra (e.g.field theory, algebraic geometry, number theory, and group theory), analysis (non standard analysis, complex manifolds and the geometry of Banach spaces) and theoretical computer science (via finite model theory) as well as to set theoretic topology and set theory. This course is the first in a sequence of three courses. The purpose of this course is to present the basic concepts and techniques of model theory with an emphasis on pure model theory. The main theorem of the course is Morley's theorem. It will be presented in a way that permits several powerful extensions.

Contents include: Similarity types, structures. Downward Lowenheim-Skolem theorem. Construction of models from constants, applications of the compactness theorem, model completness, elementary decideability results, Henkin's omitting types theorem, prime models. Elementary chains of models, some basic two-cardinal theorems, saturated models (characterization and existence), basic results on countable models including Ryll-Nardzewski's theorem. Indiscernible sequences, and connections with Ramsey theory, Ehrenfeucht-Mostowski models. Introduction to stability (including the equivalence of the order-property to instability), chain conditions in group theory corresponding to stability/superstablity/omega-stability, strongly minimal sets, various rank functions, primary models, and a proof of Morley's categoricity theorem. Basic facts about infinitary languages, computation of Hanf-Morley numbers.

Prerequisites: This is a graduate level course, while at the beginning the pace is slow to accommodate everybody it speeds up in the second half. In the past many, in fact the majority of students where undergraduates, so I decided to keep the prerequisites to the minimum of "an undergraduate level" course in logic.

Text: Rami Grossberg, A course in model theory, a book in preperation.

Most of the material (and much more) appears in the following books:

Evaluation: Will be based on weekly homework assignments (20%), a 50 minutes midterm (20%) and a 3 hours inclass comprehensive final written examination (60%).

Date for the midterm: Will be held on Monday March first.

Model Theory homework.