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In 1924 [[Louis de Broglie]] proposed that electrons in an atom are constrained not in "orbits" but as standing waves. In detail his solution did not work, but his hypothesis – that the electron "corpuscle" moves in the atom as a wave – spurred [[Edwin Schrodinger]] to develop a [[Schrodinger equation | wave equation]] for electrons; when applied to hydrogen the Rydberg formula was accurately reproduced. In 1928 [[Paul Dirac]] published his [[Dirac equation | relativistic wave equation]] simultaneously incorporating [[Theory of relativity| relativity]], predicting [[anti-matter]], and providing a complete theory for the Stern-Gerlach result (that there are only two directions that can be measured for silver atoms and for electrons themselves) . These successes launched a new fundamental understanding of our world at small scale: quantum mechanics.
[[Max Born]]'s 1924 paper ''"Zur Quantenmechanik"'' was the first use of the words "quantum mechanics" in print.<ref>Max Born, ''My Life: Recollections of a Nobel Laureate'', Taylor & Francis, London, 1978. ("We became more and more convinced that a radical change of the foundations of physics was necessary, i.e., a new kind of mechanics for which we used the term quantum mechanics. This word appears for the first time in physical literature in a paper of mine...")</ref><ref>{{Cite journal |last=Fedak |first=William A. |last2=Prentis |first2=Jeffrey J. |date=2009-02-01 |title=The 1925 Born and Jordan paper “On quantum mechanics” |url=https://
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