[1] Examples include Cooper pairs, semiconductor excitons, mesons, superfluid helium, Bose–Einstein condensates, atomic bosons, and fermionic condensates.
A composite particle containing an even number of fermions is a boson, since it has integer spin.
These composite particle states have a symmetric wave function upon exchange of any pair of particles.
The wave function is given by the permanent of single particle states for the non-interacting case.
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