Bosons and Fermions
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The rest of this book is dedicated to the quantum theory of a one-body (or one-particle) system. Even the hydrogen atom, which is called the quantum two-body problem, reduces to two one-body problems: one for the center of mass of the two bodies and one for an electron (with a slightly adjusted mass) interacting with the external potential energy generated by the electric charge of a proton located at a fixed position. However, we must make some mention in this short chapter of how multi-body problems are handled.