The Principles of Quantum MechanicsThe first edition of this work appeared in 1930, and its originality won it immediate recognition as a classic of modern physical theory. The fourth edition has been bought out to meet a continued demand. Some improvements have been made, the main one being the complete rewriting of thechapter on quantum electrodymanics, to bring in electronpair creation. This makes it suitable as an introduction to recent works on quantum field theories. 
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LibraryThing Review
User Review  yapete  LibraryThingThe classic on the formalism of quantum mechanics. Only for the serious... But if you understand this stuff, this is one of the most clear and lucid books on QM ever written. Read full review
LibraryThing Review
User Review  agricolaoval  LibraryThingDirac had a knack of explaining quite complicated things in a simple and understandable way. This is of course an old book, and it is very elementary, but I still remember the joyful feeling of being ... Read full review
Contents
THE PRINCIPLE OF SUPERPOSITION  1 
The Polarization of Photons 3 Interference of Photons  7 
Superposition and Indeterminacy  10 
Mathematical Formulation of the Principle  14 
Bra and Ket Vectors  18 
DYNAMICAL VARIABLES AND OBSERVABLES  23 
Conjugate Relations  26 
Eigenvalues and Eigenvectors  29 
The Perturbation considered as causing Transitions  172 
Application to Radiation  175 
Transitions caused by a Perturbation Independent of the Time  178 
The Anomalous Zeeman Effect  181 
COLLISION PROBLEMS  185 
The Scattering Coefficient  188 
Solution with the Momentum Representation  193 
Dispersive Scattering  199 
Observables  34 
Functions of Observables  41 
The General Physical Interpretation  47 
Commutability and Compatibility  49 
REPRESENTATIONS  53 
The d Function  58 
Properties of the Basic Vectors  62 
The Representation of Linear Operators  67 
Probability Amplitudes  72 
Theorems about Functions of Observables  76 
Developments in Notation  79 
THE QUANTUM CONDITIONS  84 
Schrödingers Representation  89 
The Momentum Representation  94 
Heisenbergs Principle of Uncertainty  97 
Displacement Operators  99 
Unitary Transformations  103 
THE EQUATIONS OF MOTION  108 
Heisenbergs Form for the Equ of Motion  111 
Stationary States  116 
The Free Particle  118 
The Motion of Wave Packets  121 
The Action Principle  127 
The Gibbs Ensemble  130 
ELEMENTARY APPLICATIONS  136 
Angular Momentum  140 
Properties of Angular Momentum  144 
The Spin of the Electron  149 
Motion in a Central Field of Force  152 
Energylevels of the Hydrogen Atom  156 
Selection Rules  159 
The Zeeman Effect for the Hydrogen Atom  165 
PERTURBATION THEORY  167 
The Change in the Energy levels caused by a Perturbation  168 
Resonance Scattering  201 
Emission and Absorption  204 
ST CMS CONTAINING SEVERAL SIMILAR PARTICLES  207 
Permutations as Dynamical Variables  211 
Permutations as Constants of the Motion  213 
Determination of the Energylevels  216 
Application to Electrons  219 
THEORY OF RADIATION  225 
The Connexion between Bosons and Oscillators  227 
Emission and Absorption of Bosons  232 
Application to Photons  235 
The Interaction Energy between Photons and an Atom  239 
Emission Absorption and Scattering of Radiation  244 
An Assembly of Fermions  248 
RELATIVISTIC THEORY OF THE ELECTRON  253 
The Wave Equation for the Electron  254 
Invariance under a Lorentz Transformation  258 
The Motion of a Free Electron  261 
Existence of the Spin  263 
Transition to Polar Variables  267 
The Finestructure of the Energylevels of Hydrogen  269 
Theory of the Positron  273 
QUANTUM ELECTRODYNAMICS  276 
Relativistic Form of the Quantum Conditions  280 
The Dynamical Variables at one Time  283 
The Supplementary Conditions  287 
Electrons and Positrons by Themselves  292 
The Interaction  298 
The Physical Variables  302 
Interpretation  306 
Applications  310 
313  
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Common terms and phrases
according angular momentum applied arbitrary atom basic becomes belonging bosons called classical coefficient commute complete components conjugate connected consider consisting constant continuous coordinates corresponding defined definite depends describing determined diagonal direction discrete displacement dynamical system dynamical variables eigenket eigenvalues electron energy equal equation equations of motion expressed factor field follows formula function further given gives Hamiltonian Heisenberg hence holds imaginary independent integral interaction introduce involve ket vector kind linear operator mathematical matrix elements meaning measurement method multiplied namely observables obtain occur original particles permutation perturbation photon physical picture polarization positive possible present probability quantities quantum mechanics radiation range referring relations representation representative requires respect result rule satisfy scattering Schrödinger shows side simultaneous solution stationary symmetrical theory tion transformation transition unit unperturbed values vanish written zero