L2.4 Degenerate Perturbation Theory: Leading energy corrections

L3.1 Remarks on a 'good basis'

L1.1 General problem. Non-degenerate perturbation theory

L1.4 First order correction to the state. Second order correction to energy

Degeneracy in QM

L1.3 Calculating the energy corrections

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L2.3 Degenerate Perturbation theory: Example and setup

L7.1 The WKB approximation scheme

L2.1 Remarks and validity of the perturbation series

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L3.2 Degeneracy resolved to first order; state and energy corrections

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L1.2 Setting up the perturbative equations

L9.1 The interaction picture and time evolution

Photons and the loss of determinism

Lecture 1: Introduction to Superposition

L2.2 Anharmonic Oscillator via a quartic perturbation

L9.3 Example: Instantaneous transitions in a two-level system