New posts in Variational Calculus

Varying the action with respect to the metric in one dimension

How to calculate functional derivative correctly?

Lagrangian mechanics, infinitesimal movements expressed in coordinate basis

How do physicists know when it is appropriate to use $\mathrm dx$ as if it is a number?

Principle of stationary action vs Euler-Lagrange Equation

Euler-Lagrange equation in curved spacetime: how to calculate $\partial \mathcal{L}/\partial(\nabla_\nu A_\mu)$?

What's the variation of the Christoffel symbols with respect to the metric?

Poincare transformations and "three kinds of infinitesimal variations"

Vector calculus in classical fields

Varying the Einstein-Hilbert action without reference to a chart