My Math Forum  

Go Back   My Math Forum > College Math Forum > Real Analysis

Real Analysis Real Analysis Math Forum

Thanks Tree1Thanks
  • 1 Post By Maschke
LinkBack Thread Tools Display Modes
September 24th, 2017, 10:40 AM   #1
Joined: Jan 2016
From: United Kingdom

Posts: 33
Thanks: 0

A question to do with lebesgue integration

Hello all,

I was set a question on lebesgue integration. Please find attached the question and my attempted proof. Am i right?

Attached Images
File Type: jpg IMG_2263.jpg (87.2 KB, 12 views)
Magnitude is offline  
September 24th, 2017, 11:58 AM   #2
Senior Member
Joined: Aug 2012

Posts: 1,956
Thanks: 547

Others may have more patience but personally I don't spend time on unreadable images. In this case it's handwritten (nicely, but still); poorly lit; and has such poor contrast that it's unreadable.

Often if I'm interested in a problem that's accompanied by a low-quality image, being a bit of an amateur photographer I'll save the image to my hard drive and work it in an image editing program. In your case you posted a tiny image, 180x200 pixels. There is literally nothing to work with. It's the worst of all possible worlds.

In general you should lay your copy on a table and place a pair of table lamps on either side. That approximates two soft lights at 45 degree angles, not a bad setup for copy work.

Then hold your phone or camera steady, make sure it's in focus and take a few shots. Then look at them blown up on the computer and post the best of the lot.

I hope someone reads this and learns to post good images.

For the OP, I have a suggestion. Post your argument here, marked up in $\LaTeX$ or with symbols copy/pasted from Type mathematical symbols - online keyboard.

The discipline of marking up a problem often results in solving it. You're forced to go slowly and think about everything you're writing. It's just like at work when someone asks for your advice on a technical matter. You just go, "Explain it to me," and halfway through explaining their problem to you they suddenly see the answer. They think you're a genius. All you did was make someone re-ask their own question.

Thanks for reading my idle thoughts today. I really do think there's way too many badly-shot homework problems online. The mental discipline to take a good photo is exactly the same as the mental discipline to do math. I prefer markup but if someone's going to take a photo, take the time to make a good photo.

OP I hope you will take my photographic and mathematical suggestions as constructive. I see you have a good mathematical handwriting and no doubt write math in a thoughtful manner.
Thanks from Joppy

Last edited by Maschke; September 24th, 2017 at 12:07 PM.
Maschke is online now  
September 25th, 2017, 09:43 AM   #3
Joined: Jan 2016
From: United Kingdom

Posts: 33
Thanks: 0


Comments appreciated. I was actually unaware of the latex software until recently. Having got some practise with it , i can see how it makes taking photos of written work redundant (faster and clearer).
Magnitude is offline  

  My Math Forum > College Math Forum > Real Analysis

integration, lebesgue, question

Thread Tools
Display Modes

Similar Threads
Thread Thread Starter Forum Replies Last Post
Lebesgue integral question Fabion Real Analysis 0 March 20th, 2014 09:10 AM
Lebesgue Points Question Fabion Real Analysis 0 March 10th, 2014 03:48 AM
Lebesgue integration question Fabion Real Analysis 0 February 24th, 2014 03:39 AM
LEBESGUE INTEGRATION thamy_271091 Calculus 9 December 7th, 2012 06:34 AM
a question about Lebesgue measurable function mathabc Real Analysis 0 June 23rd, 2011 10:11 PM

Copyright © 2018 My Math Forum. All rights reserved.