`BookProof.QgOuterFockFullFL.qgSectorExt_symmetricOn` (n : ℕ) : SymmetricOn (harmFried (n * 84)).dom (qgSectorExt n)

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`BookProof.QgOuterFockFullFL.qgSectorExt_symmetricOn` (n : ℕ) : SymmetricOn (harmFried (n * 84)).dom (qgSectorExt n) · Prove2Me