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`BookProof.DirectSumEsa.dsOp_deficiencyTrivialAt` (H : ∀ i, D i →ₗ[ℂ] G i) {z : ℂ} (h : ∀ i, DeficiencyTrivialAt (D i) (H i) z) : DeficiencyTrivialAt (dsCore D) (dsOp H) z · Prove2Me