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`BookProof.YangMillsFockGapChain.ym_fock_gap_of_field_perturbation` {mu : ℝ} (hmu : 0 < mu) (hgap : ∀ x : finiteModeDomain (coreBasis e), mu * ‖(x : L2d 99)‖ ^ 2 ≤ quadForm (ymHami · Prove2Me