# Question about singular integral eq.

1. Nov 24, 2013

### rugphy

Hi,
I've questions about the Fredholm integral equation :
1. Is an following eq.
$a(x)y(x) + \int^{∞}_{-∞}\frac{\sin(x-y)}{x-y}dy = f(x)$
be defined as singular integral equation, if it is how can i get the solution?
2. What is the definition of singular kernel and is the kernel in (1)?

Thank you.

2. Nov 24, 2013

### mathman

I suggest you look carefully at your post. The integral is constant (not dependent on x). I believe you need some function of y under the integral sign.

3. Nov 24, 2013

### rugphy

Sorry, there are flaws in the above eq. It should be
$a(x)y(x) + \int^{∞}_{-∞}\frac{\sin(k(x-t))}{π(x-t)}y(t)dt = f(x)$
where a(x) and f(x) are known functions, and y(x) is unknown function.

4. Nov 24, 2013

### rugphy

Thanks you very much for that remark. In future, I will do it more carefully.

5. Nov 25, 2013

### mathman

It is called singular because the absolute value of the kernel is not integrable. Solving Fredholm equations is a major branch of analysis - there is no simple answer.