The Delta Operator (Variational Operation)

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Introduction to Variational Calculus - Deriving the Euler-Lagrange Equation

Functional differentiation

The Hanging Chain (Catenary) Problem

Variational Operator

Partial Derivatives and the Gradient of a Function

The Brachistochrone Problem

Green's functions: the genius way to solve DEs

Calculus of Variations ft. Flammable Maths

Deriving Hamilton's Principle

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Approximate Solutions - The Galerkin Method

Lagrangians And Hamiltonians 4: Oscillations and Normal Modes

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The Math of Bubbles // Minimal Surfaces & the Calculus of Variations #SoME3

The Calculus of Variations and the Euler-Lagrange Equation

Approximate Solutions - The Ritz Method

Lec 7: Variational Calculus, Lagrange's Equations

Understanding the Euler Lagrange Equation