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Reference.org
Born rule
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<p>The Born rule is a postulate of <a href="/facts/Quantum_mechanics/BRc3Mzgr">quantum mechanics</a> that gives the <a href="/facts/Probability/fgYvMhwb">probability</a> that a <a href="/facts/Measurement_in_quantum_mechanics/VY7jPfP0">measurement of a quantum system</a> will yield a given result. In one commonly used application, it states that the <a href="/facts/Probability_density_function/zvfybna4">probability density</a> for finding a particle at a given position is proportional to the square of the amplitude of the system's <a href="/facts/Wavefunction/KgM5ykjY">wavefunction</a> at that position. It was formulated and published by German physicist <a href="/facts/Max_Born/6VnUDWhA">Max Born</a> in July 1926. </p>