Difference of two functions sharing the same poles pole-free?

In summary, the difference of two functions sharing the same poles pole-free is a mathematical concept where two functions have the same poles and the difference between them does not have any additional poles. This is calculated by subtracting one function from the other, and the resulting function is pole-free. This concept is significant in complex analysis and can be applied in real-world situations such as modeling complex systems and solving mathematical problems involving functions with poles.
  • #1
Grothard
29
0
If f(z) and g(z) share all the same poles, is f(z)-g(z) pole-free? I feel like this would be true, but I can't really come up with a proof for it.
 
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  • #2
No, consider 1/x and 1/(2x). These both have poles at zero.

But 1/x - 1/(2x)=1/(2x) which also has a pole at zero.

Or did I misunderstood the question?
 
  • #3
Certainly not. Here's the simplest counter-example: f = a*g where a is a constant, so f-g has the same poles as f. More complicated examples exist as well.
 

1. What is the definition of "difference of two functions sharing the same poles pole-free"?

The difference of two functions sharing the same poles pole-free is a mathematical concept where two functions have the same poles (points where the function is undefined) and the difference between them does not have any additional poles.

2. How is the difference of two functions with the same poles calculated?

The difference of two functions sharing the same poles pole-free is calculated by subtracting one function from the other. This means that the value of the difference at any given point is equal to the difference between the values of the two functions at that point.

3. Can the difference of two functions with the same poles have poles?

No, the difference of two functions sharing the same poles pole-free cannot have any poles. This is because the poles of the two functions cancel each other out when subtracted, resulting in a function that is pole-free.

4. What is the significance of two functions sharing the same poles pole-free?

Two functions sharing the same poles pole-free are important in the study of complex analysis. They can help simplify calculations and provide insights into the behavior of functions with poles.

5. How can the concept of difference of two functions sharing the same poles pole-free be applied in real-world situations?

The concept of difference of two functions sharing the same poles pole-free can be applied in various fields such as physics, engineering, and economics. It can be used to model complex systems and analyze their behavior, as well as to solve various mathematical problems involving functions with poles.

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