Date & Time: Wednesday, January 07, 2015, 16:00-17:00.
Venue: Ramanujan Hall

Speaker: S. M. Srivastava, ISI Kolkota

Title: Ultraproduct of models and an application to algebra

Abstract: In this talk we shall introduce the notion of ultraproduct of models. This is a very useful notion of product of algebraic structures that should be better known to mainstream mathematicians. As an application we shall briefly sketch the proof of Ax-Kochen theorem on the field Q_p of p-adic reals.

We shall completely define all the necessary notion from logic. However, some background in algebra, particularly in valuation theory, will be assumed.