Help Solving Integral Inequality: f to 1/f

  • Context: Graduate 
  • Thread starter Thread starter shegiggles
  • Start date Start date
  • Tags Tags
    Inequality Integral
Click For Summary

Discussion Overview

The discussion revolves around the integrability of the function 1/f given that f is integrable and bounded below. Participants explore the conditions under which this statement might hold, including specific examples and counterexamples.

Discussion Character

  • Debate/contested
  • Mathematical reasoning

Main Points Raised

  • One participant expresses confusion and requests assistance with the problem regarding the integrability of 1/f.
  • Another participant argues against the statement by providing a counterexample, specifically f(x) = x on the interval [0,1].
  • A different participant suggests that the original claim might hold under the condition that 0 < |f| < k for some constant k on the interval [0,1].
  • Some participants challenge the clarity of the problem statement and suggest that it may not be accurately represented as initially written.
  • One participant asserts that the question has been shown to be false based on the previous contributions.

Areas of Agreement / Disagreement

Participants do not reach a consensus; there are competing views regarding the validity of the original claim and the conditions necessary for it to hold.

Contextual Notes

There are unresolved assumptions about the conditions under which f is defined and the implications of its boundedness. The discussion highlights the need for precise definitions and conditions in mathematical statements.

shegiggles
Messages
3
Reaction score
0
I really need help on this. Completely lost. Please help me.
Let f: [a,b] -> R. Given f is integrable and bounded below, show 1/f is integrable.
 
Physics news on Phys.org
It's not true. What about f(x)=x on [0,1]?
 
Well, perhaps he meant that 0<|f|<k, on [0,1] for some constant k?
 
Erm, arildno, you should reread that. (k=1...).
 
matt grime said:
Erm, arildno, you should reread that. (k=1...).

can you please help me with this problem?
Thanks
 
We can't because we have shown the question to be false.
 
It would help if you would state exactly what the problem is. It cannot be what you originally wrote!
 

Similar threads

  • · Replies 31 ·
2
Replies
31
Views
5K
  • · Replies 11 ·
Replies
11
Views
2K
  • · Replies 30 ·
2
Replies
30
Views
4K
  • · Replies 4 ·
Replies
4
Views
2K
  • · Replies 20 ·
Replies
20
Views
4K
  • · Replies 6 ·
Replies
6
Views
3K
  • · Replies 2 ·
Replies
2
Views
2K
  • · Replies 16 ·
Replies
16
Views
4K
  • · Replies 6 ·
Replies
6
Views
4K