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`BookProof.YangMillsFockGapChain.ym_fock_gap_of_nested_ritz_bands` {mu : ℝ} (hmu : 0 ≤ mu) {lo hi : ℕ → ℝ} (hnest : NestedBands lo hi) (hritz : ∀ m, ritzInf (ymHamiltonian (coreRep · Prove2Me