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)
Lean names referenced from this declaration's body.