`BookProof.ChapterG2.brst_physical_iff_gauge_invariant` (a : A) : (![a, 0] ∈ brstKer Q) ↔ Q * a = 0

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`BookProof.ChapterG2.brst_physical_iff_gauge_invariant` (a : A) : (![a, 0] ∈ brstKer Q) ↔ Q * a = 0 · Prove2Me