21-624 Topics in analysis: descriptive set theory Instructor: Ernest Schimmerling MWF 12:30 Room: Gates-Hillman 4101 12 units Descriptive set theory combines analysis and logic. The required background is undergraduate level analysis, logic and set theory. The recommended textbook is Kechris, "Classical Descriptive Set Theory", Graduate Texts in Mathematics 156, Springer-Verlag. Another useful book is Moschovakis, "Descriptive Set Theory". The topics to be covered include: Polish spaces (Baire space, Cantor space, etc.); classical definability hierarchies (Borel Hierarchy, Projective Hierarchy); effective definability hierarchies; the Wadge hierarchy; complete sets, universal sets; separation; reduction; uniformization; prewellordering; scales; perfect sets; Baire measurability; Lebesgue measurability; Suslin operation; substitution property; basis theorems; tree representations; proofs of determinacy (Borel determinacy); applications of determinacy; definable winning strategies; theorems on the boundedness of norms; theorems on the ranks of wellfounded relations (Kunen-Martin); admissible ordinals; stable ordinals. In addition to more standard graduate course mechanics, student enrolled for a grade will be assigned more advanced individual reading projects on which they will lecture towards the end of the semester. 21-700 Math Logic II Instructor: Jose Iovino MWF 11:30 Room: Wean Hall 7201 12 Units In the first part of the course we will focus on the limitations of first-order logic: Godel's Incompleteness Theorems, the undecidability of first-order logic, and Tarski's theorem on the undefinablity of truth. In the second part we will study extensions of first-order logic (infinitary logics, second order logic, generalized quantifiers), and we will prove Lindstrom's Theorems on the maximality of first-order logic. Textbooks: M. Goldstern and H. Judah, "The Incompleteness Phenomenon", A K Peters/CRC Press (July 30, 1998) H.-D. Ebbinghaus, G. Flum, and W. Thomas, "Mathematical Logic", Springer-Verlag, 1994. 21-803 Model Theory III Rami Grossberg (Rami@cmu.edu) URL: www.math.cmu.edu/~rami MWF 3:30-2:20PM Room: Wean Hall 7201 12 Units This will be different than courses I offered in recent years. It will not depend on Model theory II. This time I will concentrate in classification theory for first-order theories. Prerequisites: Elementary model theory (half of 21-603) or permission of the instructor. Text: There is no official text. Some of the material appears in the following books: J. Baldwin, Fundamentals of stability theory, S. Buechler, Essential Stability theory. A. Pillay, Stability Bruno Poizat, A course in Model Theory, Springer-Verlag 2000. Saharon Shelah, Classification Theory North-Holland 1991. This is the most important and the least readable book in model theory. 21-805 Lambda Calculus Instructor: Rick Statman with possible guest lecturers Henk Barendregt and Dana Scott MWF 1:30 Room: Doherty Hall 1211 12 Units Textbook: The Lambda Calculus by Henk Barendregt, North Holland 1981, ISBN 0 444 85490 8 (2nd edition & paperback editions OK) Description: @ Although an introductory graduate course the only prerequisite for this course is an undergraduate course in logic and computability theory. @ Topics covered include (1)Basic properties of reduction and conversion (2)Reduction and conversion strategies (3)Calculability and representation of data types (4)Theory of Ershov numberings (5)Bohm's theorem, easy terms, and other exotic combinations (6)Solvability of functional equations (unification) (7)Combinators and bases (8)Simple and algebraic types (9)Labelled reduction and intersection types (10)Extensionality and the omega rule @ Each of these topics includes several beautiful research problems. These range in difficulty from ones suitable for senior thesese to ones suitable for PhD dissertations. Students are free to pursue whichever problems appeal to them. Requirements: Enrolled students can work together in teams to produce lecture notes due at the end of the semester.