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    Scientists / Open questions

    Lev Landau

    Condensed matter physics; quantum theory; fluid mechanics

    1962 Nobel Prize in Physics

    2 questions

    1. Genuine complex-region Landau singularities for general Feynman graphs

    2. First-principles microscopic derivation of the full excitation spectrum of superfluid liquid 4He (Landau, 1949)

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