## What are the Euler-Lagrange equations?

## What is Euler's equation 3?

- Definition 3
**Equation**() is the**Euler**-**Lagrange equation**, or sometimes just**Euler**'s**equation**. Warning 1 You might be wondering what is suppose to mean: how can we differentiate with respect to a derivative?

## What is Lagrange's theory of evolution?

- In Lagrangian mechanics, according to Hamilton's principle of stationary action, the evolution of a physical system is described by the solutions to the
**Euler equation**for the action of the system. In this context**Euler**equations are usually called**Lagrange**equations.

## What is the formula for Lagrangian function?

- Define: Lagrangian Function L = T – V (Kinetic – Potential energies)

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