Uniform Continuity Proof for Periodic and Continuous Functions | Analysis Help

In summary, if a function is both periodic and continuous, it can be proven to be uniformly continuous on a given set, such as the set of all real numbers. This is because a finite interval can be used to examine the function's periodicity. However, the definition of periodicity must also be considered when making this conclusion.
  • #1
kiriyama
6
0
1. Prove if f:R->R is periodic and continuous, then f is uniformly continuous



2. There exists h that does not equal zero such that f(x+h)=f(x)
 
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  • #2
Can you think of any results you know about conditions that make continuous functions into uniformly continuous ones?
 
  • #3
For 1, I agree with matt grime, Think about theorems that say when a continuous function is uniformly continuous (on a given set of course- "uniform" continuity is always defined on a given set. You want to prove that this function is uniformly continuous on the set of all real numbers. Knowing the function is periodic means you can look at a finite interval!)

For 2, exactly what is the DEFINITION of "periodic"?
 

1. What is uniform continuity?

Uniform continuity is a type of continuity that ensures that a function's behavior remains consistent over a certain range of values. This means that the function remains close to its values as the input values change.

2. How is uniform continuity different from regular continuity?

Uniform continuity differs from regular continuity in that it focuses on the behavior of a function over a specific range of values, rather than just a single point. This means that a function can be uniformly continuous without being continuous at a specific point, but a function must be continuous at every point in order to be uniformly continuous.

3. How is uniform continuity proven for periodic and continuous functions?

To prove uniform continuity for periodic and continuous functions, we typically use the definition of uniform continuity, which states that for any given epsilon greater than zero, there exists a delta greater than zero such that the distance between the function's values at two points within delta is less than epsilon. We then use algebraic manipulations and the periodicity of the function to show that this condition is satisfied.

4. What are some common techniques used in uniform continuity proofs?

Some common techniques used in uniform continuity proofs include the use of the definition of uniform continuity, the triangle inequality, and algebraic manipulations. In some cases, we may also use the intermediate value theorem to show that a function is uniformly continuous.

5. Are all continuous functions also uniformly continuous?

No, not all continuous functions are uniformly continuous. A function must satisfy the definition of uniform continuity in order to be considered uniformly continuous. While all uniformly continuous functions are continuous, the reverse is not always true.

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