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Apr 11, 2023 at 20:23 vote accept António Borges Santos
Apr 10, 2023 at 13:06 history edited Alexandre Eremenko CC BY-SA 4.0
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Apr 10, 2023 at 13:05 comment added LSpice I think that actually the zero set of $f_n$ must contain, not necessarily be contained in, the zero set of $f$ (and it is a non-strict inequality).
Apr 10, 2023 at 13:04 history edited Alexandre Eremenko CC BY-SA 4.0
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Apr 10, 2023 at 13:03 comment added Alexandre Eremenko You are right but this does not affect the answer. I corrected.
Apr 10, 2023 at 12:57 history answered Alexandre Eremenko CC BY-SA 4.0