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quantum mechanics


from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. Quantum theory, especially the quantum theory of the structure and behavior of atoms and molecules.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. The branch of physics which studies matter and energy at the level of atoms and other elementary particles, and substitutes probabilistic mechanisms for classical Newtonian ones.
  • n. Something overly complicated or detailed.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • n. the branch of quantum physics that accounts for matter at the atomic level; an extension of statistical mechanics based on quantum theory (especially the Pauli exclusion principle)


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  • If you think you understand quantum mechanics, you don't understand quantum mechanics�?
    — Richard Feynman

    July 15, 2008