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def definition def or abbrev

statisticsFromSpin

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formal statement (Lean)

 167def statisticsFromSpin (s : Spin) : Statistics :=

proof body

Definition body.

 168  if s.isHalfInteger then Statistics.fermiDirac else Statistics.boseEinstein
 169
 170/-- **THEOREM (Spin-Statistics)**: Half-integer spin implies Fermi-Dirac statistics. -/

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