Can we have a pasting lemma for uniform continuous functions

In summary, the pasting or gluing lemma in analysis states that two continuous functions can be combined to create another continuous function. This lemma is implicit in the use of piecewise functions. It is possible to have a similar situation for uniform continuous functions if the space X has the property that every ball is path connected. In the context of real numbers, gluing two closed intervals or taking the finite union of compact sets will maintain uniform continuity.
  • #1
PKSharma
2
0
In analysis, the pasting or gluing lemma, is an important result which says that two continuous functions can be "glued together" to create another continuous function. The lemma is implicit in the use of piecewise functions. Can we have a similar situation for uniform continuous functions?
 
Physics news on Phys.org
  • #2
The result hold when X has the property that every ball is path connected.
 
  • #3
PKSharma said:
In analysis, the pasting or gluing lemma, is an important result which says that two continuous functions can be "glued together" to create another continuous function. The lemma is implicit in the use of piecewise functions. Can we have a similar situation for uniform continuous functions?

In what context are you working? Real numbers? Connected metric/topological spaces?

For example, gluing two closed intervals keeps things uniform continuous. I guess the finite union of compacts will work too.
 

Related to Can we have a pasting lemma for uniform continuous functions

1. What is a pasting lemma for uniform continuous functions?

A pasting lemma for uniform continuous functions is a mathematical theorem that states that if two functions are uniformly continuous on a closed interval and their values match on the boundary of the interval, then the two functions can be "pasted" together to create a new function that is also uniformly continuous on the entire interval.

2. Why do we need a pasting lemma for uniform continuous functions?

A pasting lemma for uniform continuous functions helps to extend the continuity of functions from closed intervals to open intervals. This can be useful in many areas of mathematics, such as in the analysis of differential equations.

3. Can the pasting lemma be applied to non-uniformly continuous functions?

No, the pasting lemma only applies to uniformly continuous functions. This is because non-uniformly continuous functions may have sudden, large changes in their values, making it impossible to smoothly "paste" them together.

4. What are the conditions for the pasting lemma to hold?

The pasting lemma for uniform continuous functions holds when the two functions being "pasted" together are uniformly continuous on a closed interval and their values match on the boundary of the interval. Additionally, the resulting pasted function must also be uniformly continuous on the entire interval.

5. Can the pasting lemma be applied to an infinite number of functions?

Yes, the pasting lemma can be applied to an infinite number of functions as long as each individual function satisfies the conditions of the lemma. This is because the lemma is a general theorem that applies to any number of functions that meet its requirements.

Similar threads

  • Topology and Analysis
Replies
4
Views
398
Replies
1
Views
954
  • Topology and Analysis
Replies
9
Views
3K
  • Topology and Analysis
Replies
1
Views
2K
Replies
1
Views
1K
  • Topology and Analysis
Replies
7
Views
1K
  • Topology and Analysis
Replies
2
Views
1K
Replies
2
Views
2K
Replies
6
Views
1K
Back
Top