ONE PER CENT Mathematics workshop for students of classes XI and XII Friday 29th November 2013 IMSc, Chennai TIMETABLE 900 am Registration 930am--1030am Vijay Kodiyalam Title: Rotations and quaternions Abstract: We will discuss rotations in 3-dimensional space and their connection to the number system of quaternions which is a pleasant interplay of analytical geometry, trigonometry and algebra. 1030am--1100am Tea break (coffee/tea, snacks) 1100am--noon Shailesh Shirali Title: Snapshots from transformation geometry Abstract: The talk is about transformations in geometry. In 1872 the German mathematician Felix Klein proposed (in what is now a famous lecture) that geometry can be studied more systematically by categorizing the transformations it uses; more specifically, by studying the properties that stay invariant under particular groups of transformations. We will not be talking about Klein's programme as such but we will show how transformations can be an effective and elegant problem-solving approach in solving problems in geometry. We will also briefly look at frieze patterns and see how they fit into this framework. noon--100pm R Ramanujam Title: Investigating, combinatorially Abstract: Many students find projects and open ended investigations natural and feasible in the sciences but not in mathematics. We suggest that such projects are indeed possible and illustrate the idea with some examples from elementary combinatorics. 100pm--215pm Lunch 215pm--315pm S Viswanath Title: Partitions Abstract: A partition is a way of writing a given number as a sum of smaller numbers. For instance the number 4 can be partitioned in five ways as 4, 3+1, 2+2, 2+1+1, 1+1+1+1. The theory of partitions spans 300 years, from the works of Euler in the eighteenth century, Ramanujan in the early 1900s, all the way to very recent breakthroughs by the mathematicians Bruinier and Ono in 2011. In this lecture, we will study some elementary properties of partitions, and see how to count partitions of various kinds. 315pm--400pm Quiz 400pm--430pm High tea 430pm--500pm Remarks by R Balasubramanian (Director, IMSc) and Rajeeva Karandikar (Director, CMI); distribution of prizes