## Concepts in Quantum Mechanics"Students of quantum mechanics are saved trouble if they are not led through all the historical pitfalls, and instead acquainted from the very beginning with concepts, such as spin, that cannot be grasped except by quantum mechanical means... In this sense the present work is an attempt to present advanced quantum mechanics from an elementary point of view." --Preface. |

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### Contents

Pure States in terms of state vectors allowing a probability | 5 |

Observables as operators in the abstract space spanned by | 11 |

Transformations in State Vector Space That Leave the Phy | 19 |

Copyright | |

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### Common terms and phrases

a+(k amplitude analogy angular momentum annihilation operators antineutrino antiunitary attributes baryon baryon number bosons characterized classical compensating field components computation concept conservation consider convention corresponding creation operators definite parity denoted density matrix describing Dirac Dirac equation direction eigenstates eigenvalue electric charge electromagnetic electron elementary particles energy equation example existence expectation value experimental fermion Feynman follows given graph hermitean operator identical ifi function indicated in Fig integral intrinsic parity invariance isospace isospin lepton lepton number linear magnetic matrix elements measurement symbol neutrino normalization nucleons object observable obtained P. A. M. Dirac particle conjugation phase factor photon Phys physical pions polarization positron positronium possible principle probability for finding quantum mechanics quantum numbers representation represented requires reversal of motion rotations satisfy scattering Section selection rules spin strong interactions superselection rule symmetry theory tion trace transposition true propagators unitary operator unitary transformation vacuum vanishes velocity write