Proving Identity of Continuous Functions on Q

In summary, proving the identity of continuous functions on Q is significant in mathematical analysis and topology as it allows for a deeper understanding of rational functions and serves as a foundation for more complex concepts. A continuous function on Q is defined as one that preserves continuity on the set of rational numbers. The identity can be proven using algebraic techniques, but may require additional techniques from calculus and topology. Common methods include epsilon-delta proofs, the intermediate value theorem, and the definition of continuity. However, there may be limitations in fully proving the identity using only algebraic techniques, requiring more advanced concepts and techniques in some cases.
  • #1
the_kid
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Homework Statement


Let f and g be two continuous functions defined on R.
I'm looking to prove the fact that if they agree on Q, then f and g are identical.


Homework Equations





The Attempt at a Solution


I'm not really sure where to start with this. Can someone point me in the right direction?
 
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  • #2
What definition of continuity would you like to use??
What characterizations of contintuity do you know??

What's special about [itex]\mathbb{Q}[/itex]??
 

1. What is the significance of proving the identity of continuous functions on Q?

Proving the identity of continuous functions on Q is important in mathematical analysis and topology as it allows for a deeper understanding of the properties and behavior of rational functions. It also serves as a foundation for more complex mathematical concepts.

2. How do you define a continuous function on Q?

A continuous function on Q is a function that preserves the properties of continuity on the set of rational numbers. This means that for any given point on the function's domain, small changes in the input value will result in small changes in the output value.

3. Can the identity of a continuous function on Q be proven using only algebraic techniques?

Yes, the identity of a continuous function on Q can be proven using algebraic techniques such as the use of limits and the properties of rational numbers. However, it may require additional techniques from calculus and topology to fully prove the identity in some cases.

4. What are some common methods used to prove the identity of continuous functions on Q?

Some common methods used to prove the identity of continuous functions on Q include the use of epsilon-delta proofs, the intermediate value theorem, and the definition of continuity. Other techniques such as the use of series and sequences may also be applied depending on the specific function being studied.

5. Are there any limitations to proving the identity of continuous functions on Q?

There are certain limitations to proving the identity of continuous functions on Q, as it may not always be possible to fully prove the identity using only algebraic techniques. In some cases, more advanced mathematical concepts and techniques may be needed to fully prove the identity of a particular function.

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