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Mott problem
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<p>The Mott problem is an iconic challenge to <a href="/facts/Quantum_mechanics/BRc3Mzgr">quantum mechanics</a> theory: how can the prediction of spherically symmetric <a href="/facts/Wave_function/KgM5ykjY">wave function</a> result in linear tracks seen in a <a href="/facts/Cloud_chamber/89YSNbpN">cloud chamber</a>.: 119ff The problem was first formulated in 1927 by <a href="/facts/Albert_Einstein/CNTet8qu">Albert Einstein</a> and <a href="/facts/Max_Born/6VnUDWhA">Max Born</a> and solved in 1929 by <a href="/facts/Nevill_Francis_Mott/r1xrUSDh">Nevill Francis Mott</a>. Mott's solution notably only uses the wave equation, not <a href="/facts/Wavefunction_collapse/f7KvbBHK">wavefunction collapse</a>, and it is considered the earliest example of what is now called <a href="/facts/Quantum_decoherence/mngM3rxy">decoherence theory</a>. </p>