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structure definition def or abbrev

BosonLedgerEntry

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formal statement (Lean)

 329structure BosonLedgerEntry where
 330  /-- Phase accumulated (even multiple of π). -/
 331  phase : ℂ
 332  /-- Phase is +1 (integer spin). -/
 333  phase_is_plus_one : phase = 1
 334
 335/-! ## The Connection: Exchange = 2π Rotation -/
 336
 337/-- **KEY INSIGHT**: Exchanging two identical particles is topologically
 338    equivalent to rotating one of them by 2π.
 339
 340    This is the deep reason behind the spin-statistics connection:
 341    - 2π rotation of fermion: phase -1
 342    - 2π rotation of boson: phase +1
 343    - Exchange of particles: same as 2π rotation
 344    - Therefore: fermions antisymmetric, bosons symmetric -/

depends on (19)

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