Variational Theorem
The function with the lowest possible variational energy is the ground-state wavefunction of the system. This is a very useful result for finding approximations to the true ground-state wavefunction, when it can't be obtained directly.
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Variational Approach
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Variational Principle Introduction
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Variation Theorem - Proof and Illustration
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Introduction to Variational Calculus - Deriving the Euler-Lagrange Equation
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Deriving 1st Order Perturbation Theory (Energy and Wavefunction Corrections)
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William Dunham, A tribute to Euler
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The most beautiful formula not enough people understand
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Mod-06 Lec-38 Variation Method - Introduction
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Stokes' Theorem and Green's Theorem
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Quantum Chemistry 8.1 - Variational Principle
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Electrons Don't Actually Orbit Like This
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The Dirac Equation: The Most Important Equation You’ve Never Heard Of
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The Physicist Who Uncovered "Negative" Time
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Understanding Lagrange Multipliers Visually
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L1.1 General problem. Non-degenerate perturbation theory
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A Simple yet Powerful Math Trick
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Understanding Quantum Mechanics #2: Superposition and Entanglement
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An Exact Formula for the Primes: Willans' Formula
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The problem with pretending quantum mechanics makes sense | Sean Carroll
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