Here goes a theorem and its demonstration(attachment) .Sorry,I couldn't find it in english,so it's in portuguese).(adsbygoogle = window.adsbygoogle || []).push({});

We have that the intervals In=[An,Bn] wich are closed and limited.

What I want to know is: what consideration(s) is/are NOT valid on the demonstration,when we consider an open intervals?

Thank you in advance.

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# Problem demonstration

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