`BookProof.FockDegreesOfFreedom.card_ghost_eq_two_mul` (k : ℕ) : Fintype.card (Fin (k + 1) → ZMod 2) = 2 * Fintype.card (Fin k → ZMod 2)

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`BookProof.FockDegreesOfFreedom.card_ghost_eq_two_mul` (k : ℕ) : Fintype.card (Fin (k + 1) → ZMod 2) = 2 * Fintype.card (Fin k → ZMod 2) · Prove2Me