Editing Half-integer (section)

===Physics===
In physics, the [[Pauli exclusion principle]] results from definition of [[fermion]]s as particles which have [[Spin (physics)|spin]]s that are half-integers.<ref>{{cite book |first=Péter |last=Mészáros |year=2010 |title=The High Energy Universe: Ultra-high energy events in astrophysics and cosmology |page=13 |publisher=Cambridge University Press |isbn=9781139490726 |url=https://books.google.com/books?id=NXvE_zQX5kAC&pg=PA13}}</ref>

The [[energy level]]s of the [[quantum harmonic oscillator]] occur at half-integers and thus its lowest energy is not zero.<ref>{{cite book |first=Mark |last=Fox |year=2006 |title=Quantum Optics: An introduction |page=131 |series=Oxford Master Series in Physics |volume=6 |publisher=Oxford University Press |isbn=9780191524257 |url=https://books.google.com/books?id=Q-4dIthPuL4C&pg=PA131}}</ref>