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.

**Physics Forums | Science Articles, Homework Help, Discussion**

Join Physics Forums Today!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# Problem demonstration

**Physics Forums | Science Articles, Homework Help, Discussion**