Can you visually understand absolute continuity of a function over an interval?

  • Context: Graduate 
  • Thread starter Thread starter cappadonza
  • Start date Start date
  • Tags Tags
    Continuous
Click For Summary

Discussion Overview

The discussion revolves around the concept of absolute continuity of a function over an interval, particularly in relation to uniform continuity. Participants explore the definitions, distinctions, and potential visual interpretations of absolute continuity.

Discussion Character

  • Conceptual clarification
  • Debate/contested

Main Points Raised

  • One participant expresses difficulty in distinguishing between absolute continuity and uniform continuity, suggesting that uniform continuity might imply absolute continuity.
  • Another participant clarifies that uniform continuity is a global property while absolute continuity is a local property, noting that absolute continuity is related to the existence of a derivative that can be integrated to recover the original function.
  • A participant questions whether absolute continuity guarantees the existence of a derivative and seeks resources for further understanding.
  • A later reply mentions that advanced calculus texts typically cover the topic in detail, although no specific references are provided.

Areas of Agreement / Disagreement

Participants do not reach a consensus on the relationship between absolute and uniform continuity, and the discussion remains unresolved regarding the implications of absolute continuity on the existence of derivatives.

Contextual Notes

Some assumptions about the definitions of continuity types may be missing, and the discussion does not resolve the nuances of how absolute continuity relates to differentiability.

cappadonza
Messages
26
Reaction score
0
i'm having a difficult time trying to grasp what absolute continuity means, i understand uniform continuity. i can't seem to distinguish between the them.
to me it seems that if f on some inteval [a,b] is uniformly continuous then it would be absolutely continuous ?
is there a visual way of describing/thinking about absolute continuity of a function over some interval
 
Physics news on Phys.org
Uniform continuity is a global property of a function, that is when using the basic definition, you use the same (δ,ε) for all x in the interval.

Absolute continuity is a local property and is equivalent to having a derivative, which can be integrated to get the original function back.
 
Last edited:
thanks for you reply, so absoulte continuity guarantee's the functions has a derivative then ?
if so why, are there any good resources or books, where this is proved/explained in more detailed
 
I don't have any references but any good advanced calculus text will have a full discussion.
 

Similar threads

  • · Replies 10 ·
Replies
10
Views
2K
  • · Replies 4 ·
Replies
4
Views
2K
  • · Replies 33 ·
2
Replies
33
Views
4K
  • · Replies 3 ·
Replies
3
Views
2K
  • · Replies 6 ·
Replies
6
Views
2K
  • · Replies 22 ·
Replies
22
Views
6K
Replies
6
Views
7K
  • · Replies 2 ·
Replies
2
Views
2K
  • · Replies 5 ·
Replies
5
Views
2K
  • · Replies 1 ·
Replies
1
Views
2K