`BookProof.ChapterCyclicDirectSum.exists_isHilbertSum_cyclicSubspace` : ∃ S : Set H, OrthogonalCyclicFamily T hT S ∧ IsHilbertSum ℂ (fun x : S => (cyclicSubspace T hT (x : H))) (fu

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`BookProof.ChapterCyclicDirectSum.exists_isHilbertSum_cyclicSubspace` : ∃ S : Set H, OrthogonalCyclicFamily T hT S ∧ IsHilbertSum ℂ (fun x : S => (cyclicSubspace T hT (x : H))) (fu · Prove2Me