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<p>analogue.</p>

<p>For bosons, the exchange symmetry makes them bunch together, and the exchange interaction takes the form of an effective attraction that causes identical particles to be found closer together, as in <a href="page.php?w=Bose-Einstein_condensation">Bose-Einstein condensation</a>.</p>

<p>Exchange interaction effects were discovered independently by physicists <a href="page.php?w=Werner_Heisenberg">Werner Heisenberg</a> and <a href="page.php?w=Paul_Dirac">Paul Dirac</a> in 1926.</p>

<p><big>Exchange symmetry</big></p>
<p>Quantum particles</p><p>
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