**Speaker:** Abu Sufian

**Date:** 12th March, 2019

**Time: **9:15pm-10:15pm

**Abstract:** In this talk, we will start by studying a brief introduction to Calculus Variations or variational Calculus via some examples. Then we will derive one of the most important equations “Euler- Lagrange ” equation, from that we will deduce the Beltrami identity. Using this equation and identity, we will solve the following problems: the geodesic problem on a plane and on a sphere, the brachistochrone problem. If time permits, we will see the “catenary problem” also.

**Pre-requisites:** None

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