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<p>are <a href="page.php?w=boson">boson</a>s. In contrast, particles with <a href="page.php?w=half-integer">half-integer</a> spin are fermions.</p>

<p>In addition to the spin characteristic, fermions have another specific property: they possess conserved baryon or lepton <a href="page.php?w=quantum_number">quantum number</a>s. Therefore, what is usually referred to as the spin-statistics relation is, in fact, a spin statistics-quantum number relation.</p>

<p>As a consequence of the Pauli exclusion principle, only one fermion can occupy a particular</p><p>
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