`BookProof.QgOuterFockInteractionFL.QgFamily.secExt_rel` : ∀ (n : ℕ) (u : (harmFried (n * 84)).dom), ‖F.secExt n u‖ ≤ F.flK * ‖(harmFried (n * 84)).op u + (u : L2d (n * 84))‖

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`BookProof.QgOuterFockInteractionFL.QgFamily.secExt_rel` : ∀ (n : ℕ) (u : (harmFried (n * 84)).dom), ‖F.secExt n u‖ ≤ F.flK * ‖(harmFried (n * 84)).op u + (u : L2d (n * 84))‖ · Prove2Me