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Feb 8, 2022 at 12:08 comment added Carlos_Petterson @AntonPetrunin Is it even true for Hilbert spaces? I can't actually see why (or find a reference)
Dec 5, 2021 at 8:45 vote accept Carlos_Petterson
Dec 5, 2021 at 4:21 answer added Anton Petrunin timeline score: 4
Dec 5, 2021 at 4:11 comment added Anton Petrunin Your statement "I know that..." might hold ONLY for Hilbert spaces!
Dec 4, 2021 at 17:10 history asked Carlos_Petterson CC BY-SA 4.0