`BookProof.SecondQuantizationCore.exists_ne_zero_mem_dGammaCoreDomain` (hD : D ≤ D₂) {a : Hs.carrier} (haD : a ∈ D) (ha0 : a ≠ 0) : ∃ f ∈ dsCore (fun n : ℕ => fockSectorCore Hs D₂

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`BookProof.SecondQuantizationCore.exists_ne_zero_mem_dGammaCoreDomain` (hD : D ≤ D₂) {a : Hs.carrier} (haD : a ∈ D) (ha0 : a ≠ 0) : ∃ f ∈ dsCore (fun n : ℕ => fockSectorCore Hs D₂ · Prove2Me