MIT Combinatorics Seminar Structures and Algorithms in External Combinatorics Simons Lectures) Noga Alon (Tel Aviv University & IAS) April 13 - 15, 2005   4:30pm- 5:30pm    Room 3-270 ABSTRACT Ramsey Theory: Motivation, Results and Challenges The Structure of Graphs and Grothendieck Type Inequalities Property Testing and Approximation Algorithms Simons Lectures Simons Lectures