What is Calculus of Variations? In general, developments in mathematics are motivated by the need for them in applications. Calculus of variations is no exception. In fact, it was first developed in 1969 when Johann Bernoulli asked the greatest mathematical minds of his time to solve the famous ‘brachistochrone problem’. This problem involves a bead […]

### Linear Algebra: Derivation of formula for the inverse of a matrix and Cramer’s rule

In this article I shall attempt to derive a formula for the inverse of a matrix, and from there derive Cramer’s rule. I feel that many textbooks and courses on linear algebra (especially at high-school level) present matrices and their corresponding formulas and definitions without giving any hint of where these ideas came from, and […]