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inductive definition def or abbrev

SpectralSector

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formal statement (Lean)

 131inductive SpectralSector where
 132  | color : SpectralSector
 133  | weak : SpectralSector
 134  | hypercharge : SpectralSector
 135  | conjugate : SpectralSector
 136  deriving DecidableEq, Repr
 137
 138/-- Dimension of each spectral sector. -/
 139def SpectralSector.dim : SpectralSector → ℕ
 140  | .color => 3
 141  | .weak => 2
 142  | .hypercharge => 1
 143  | .conjugate => 2
 144
 145/-- The gauge group rank (dimension of the Lie algebra generators)
 146    associated with each sector. -/
 147def SpectralSector.gauge_rank : SpectralSector → ℕ
 148  | .color => 8           -- SU(3): 3²-1 = 8 generators
 149  | .weak => 3            -- SU(2): 2²-1 = 3 generators
 150  | .hypercharge => 1     -- U(1): 1 generator
 151  | .conjugate => 0       -- Not a gauge sector
 152
 153/-- The matter representation dimension (how many components
 154    a fermion field has in this sector). -/
 155def SpectralSector.matter_dim : SpectralSector → ℕ
 156  | .color => 3
 157  | .weak => 2
 158  | .hypercharge => 1
 159  | .conjugate => 2
 160
 161/-! ### Sector Dimension Theorems -/
 162
 163/-- **THEOREM**: Sector dimensions sum to 8 = |V(Q₃)|.
 164    The spectral decomposition accounts for every vertex. -/

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