In the years 1925 and 1926, matrix mechanics in
Göttingen and Erwin Schrödinger's
wave mechanics were developed. The two theories stood in a certain
competition to each other, but after many discussions they turned out to be
mathematically equivalent. At that time Pauli stood in intensive contact with
Werner Heisenberg, but also corresponded with Schrödinger. This was the
period in which that understanding of the (new) quantum theory cristallized,
which went into the literature as the "Copenhagen Interpretation". In 1933
Wolfgang Pauli's review article "Die allgemeinen Prinzipien der Wellenmechanik"
appeared in the "Handbuch der Physik". This work, the so-called "New
Testament", is just as famous and long-lived as his 1921 article on relativity.
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