Take the 2-minute tour ×
Mathematics Stack Exchange is a question and answer site for people studying math at any level and professionals in related fields. It's 100% free, no registration required.

These propositions are listed as examples in my script and I want to know the proofs (I am not able to prove them myself, unfortunately, because im not smart and very new to measure theory) :

  1. If $I=I_{1}\times ... I_n$ is a bounded Interval on $\mathbb{R}^n$, then I is measurable and it holds that $m(I)=|I_{1}|...|I_n|$ (m(I) is called the elementary n-dimensional volume

  2. Every unbounded Interval$\subset \mathbb{R}^n$ is measurable with $m(I) = \infty$ and $\mathbb{R}^n$ is measurable with $m(\mathbb{R}^n) = \infty$

  3. Every open Subset $G\subset \mathbb{R}^n$ is measurable.

  4. Every closed subset of $\mathbb{R}^n$ is measurable

  5. Every compact Subset of $\mathbb{R}^n$ has a finite measure

Do you know of a source where I can find proofs to these examples or what I have to search for to find them.

Thx in advance

share|improve this question
2  
Bartle, Elements of Integration. –  Michael Greinecker Feb 3 '13 at 17:30
    
In these lecture notes: math.chalmers.se/Math/Grundutb/GU/MMA110/A11/MeasureTheory.pdf –  malin Feb 3 '13 at 17:39
    
Zygmund, Royden, Stein... –  leo Feb 5 '13 at 13:56
add comment

Your Answer

 
discard

By posting your answer, you agree to the privacy policy and terms of service.

Browse other questions tagged or ask your own question.