This is a e-book approximately representing symmetry in quantum mechanics. The e-book is on a graduate and/or researcher point and it's written with an try and be concise, to appreciate conceptual readability and mathematical rigor. the elemental constructions of quantum mechanics are used to spot the automorphism crew of quantum mechanics. the most notion of a symmetry motion is outlined as a bunch homomorphism from a given crew, the crowd of symmetries, to the automorphism workforce of quantum mechanics. The constitution of symmetry activities is decided less than the idea that the symmetry staff is a Lie workforce. The Galilei invariance is used to demonstrate the final thought by means of giving a scientific presentation of a Galilei invariant user-friendly particle. a short description of the Galilei invariant wave equations is usually given.
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