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<p>was formulated by <a href="page.php?w=Erwin_Schr%C3%B6dinger">Erwin Schrödinger</a> using wave mechanics and <a href="page.php?w=Werner_Heisenberg">Werner Heisenberg</a> using <a href="page.php?w=matrix_mechanics">matrix mechanics</a>. The equivalence of these methods was proven later. Their formulations described the dynamics of microscopic systems but had several unsatisfactory aspects in describing measurement processes. <a href="page.php?w=John_von_Neumann">Von Neumann</a> formulated quantum theory using <a href="page.php?w=operator_algebra">operator algebra</a></p><p>
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