Mathematics Colloquium Wednesday, 18 October, 4-5 pm =================== Venue: Ramanujan Hall Host: Sudhir R Ghorpade Speaker: Trygve Johnsen, Affiliation: The Arctic University of Norway Title: Various types of codes and matroids Abstract: The talk will be about the general principles of error-correcting codes and various ways of defining such codes mathematically. We will see how some important properties, but not all properties, of the codes, are determined by certain combinatorial structures (matroids, q-matroids, etc.) associated with them.