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Jan 5, 2021 at 9:16 vote accept Ma Joad
Jan 5, 2021 at 9:15 comment added Ma Joad Oh I make a mistake. Thank you for the answer.
Jan 5, 2021 at 9:03 comment added Ma Joad Could you suggest a reference for the result used in the second paragraph? (Every set has a Lebesgue measurable subset with the same outer measure). Thank you.
Jan 5, 2021 at 1:21 history answered bof CC BY-SA 4.0