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<p>only approximately holds. As a rule, the accuracy of the approximation tends to improve as the amplitude of the wave gets smaller. For examples of phenomena that arise when the superposition principle does not exactly hold, see the articles <a href="page.php?w=nonlinear_optics">nonlinear optics</a> and <a href="page.php?w=nonlinear_acoustics">nonlinear acoustics</a>.</p>

<p><big>Quantum superposition</big></p>
<p>In <a href="page.php?w=quantum_mechanics">quantum mechanics</a>, a principal task is to compute how a certain type of wave <a href="page.php?w=wave_propagation">propagates</a></p><p>
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