## 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

Gravitation as a Compensating Field This is posaible in 187 | 1 |

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

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

Copyright | |

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amplitude analog angular momentum annihilation operators antineutrino antiunitary attributes baryon boson characterized combined inversion components computation concept conservation consider convention corresponding creation operators definite parity denoted density matrix describing Dirac equation dynamical eigenstates eigenvalue eigenvectors electric charge electrodynamics electromagnetic electron elementary particles energy equation example existence expectation value experimental fermion Feynman follows formalism given graph Hamiltonian hermitean hermitean operator identical ifi function indicated in Fig integral invariance isospace isospin labeled Landau lepton lepton number linear magnetic matrix elements measurement symbol neutrino nucleons object observable obtained operator picture orthogonal P. A. M. Dirac particle conjugation Pauli phase factor photon Phys physical pions polarization positrons possible probability for finding quantum mechanics quantum numbers represented requires respectively reversal of motion rotations satisfy Section selective measurement solution spin superselection rule symmetry operation theory tion trace unitary operator unitary transformation vacuum vanishes vector velocity Wigner