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Über die Erhaltungssätze in der Quantenmechanik [On the conservation laws of quantum mechanics]. Offprint from: Nachrichten der Gesellschaft der Wissenschaften zu Göttingen. Mathematisch-Physikalische Klasse, 1927

Weidmann, Berlin, 1928. First edition, very rare offprint, of the invention of spatial parity as a quantum mechanical conserved quantity. "Wigner was invited to Göttingen in 1927 to become Hilbert's assistant. Hilbert, already interested in quantum mechanics, felt that he needed a physicist as an assistant to complement his own expertise. This was an important time for Wigner who produced papers of great depth and significance, introducing in his paper 'On the conservation laws of quantum mechanics' (1927) the new concept of parity" (mathshistory.standrews.ac.uk/Biographies/Wigner.html). "The concept of parity, which is very important for the understanding of spectra, has no analogy in classical theory comparable to the analogy between the orbital quantum number and the angular momentum" (Wigner, Group Theory and its Application to the Quantum Mechanics of Atomic Spectra (2012), p. 182). "Wigner was a member of the race of giants that reformulated the laws of nature after the quantum mechanics revolution of 1924-25. In a series of papers on atomic and molecular structure, written between 1926 and 1928, Wigner laid the foundations for both the application of group theory to quantum mechanics and for the role of symmetry in quantum mechanics" (David J. Gross, 'Symmetry in Physics: Wigner's legacy,' Physics Today, December 1995, pp. 46-50). Wigner was awarded the Nobel Prize in Physics in 1963 "for his contributions to the theory of the atomic nucleus and the elementary particles, particularly through the discovery and application of fundamental symmetry principles." "Among Wi

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**1928**