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`BookProof.DirectSumEsa.dsOp_essentiallySelfAdjointOn` (H : ∀ i, D i →ₗ[ℂ] G i) (h : ∀ i, EssentiallySelfAdjointOn (D i) (H i)) : EssentiallySelfAdjointOn (dsCore D) (dsOp H) · Prove2Me